TWI576827B - Sound decoding device - Google Patents

Description

Sound decoding device

The present invention relates to a voice decoding device, a voice encoding device, a voice decoding method, a voice encoding method, a voice decoding program, and a voice encoding program.

Compressing the amount of sound signals and audio signals into a fraction of a tenth of the sound coding technology is an extremely important technique in the transmission and accumulation of signals. Examples of widely used voice coding techniques include code-excited linear predictive coding (CELP) for encoding signals in the time domain, and code-coded excitation coding (TCX) for encoding signals in the frequency domain. "MPEG4 AAC" standardized by "ISO/IEC MPEG".

As a method for further improving the performance of voice coding and obtaining high sound quality at a low bit rate, a band expansion technique for generating a high frequency component using a low frequency component of sound has been widely used in recent years. A representative example of the band expansion technique is, for example, an SBR (Spectral Band Replication) technique used in "MPEG4 AAC".

In the voice coding, the time envelope shape of the decoded signal obtained by decoding the coded sequence obtained by encoding the input signal is substantially different from the time envelope shape of the input signal, and sometimes it is perceived as distortion. Moreover, when the band expansion technique is used, the low frequency component of the audio signal is encoded and decoded by the above-described voice coding technique, and then the obtained signal is used to generate a high frequency component, and the time envelope shape of the high frequency component is similarly Different, sometimes it will feel like distortion.

As a solution to this problem, the following methods are known (refer to Patent Document 1 below). In other words, in order to generate a high-frequency component, the high-frequency component is divided into frequency bands in an arbitrary time zone, and information of energy of each of the frequency bands is calculated and encoded, which is shorter than the time zone. In each time zone, information about the energy of each of the frequency bands is calculated and encoded. At this time, the bandwidth of each frequency band and the length of the short time zone can be flexibly set for the frequency band divided by the above and the short time zone. Thereby, in the decoding device, for the time direction, the energy of the high-frequency component can be controlled in a short period of time, and the time envelope of the high-frequency component can be controlled every short period of time.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] U.S. Patent No. 7,191,121

However, according to the method of Patent Document 1, in order to control the time envelope of the high-frequency component in detail, it is necessary to divide into a very short period of time, and calculate the energy information of each frequency band for each of the short-time sections and Encoding, so the amount of information about the information becomes very large, and there is a problem that it is difficult to encode with a low bit rate.

In view of the above problems, it is an object of the present invention to correct the temporal envelope shape of a decoded signal with less information and to alleviate the perceived distortion.

In order to achieve the above object, the applicant invented the sound decoding device described in the following first to fourth aspects.

The sound decoding device according to the first aspect is a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and includes a code sequence analysis unit that includes a pre-recorded coded device. And the audio decoding unit receives the code sequence including the audio signal encoded in the preamble from the preceding code sequence analysis unit, and decodes the audio signal to obtain the audio signal; and the time envelope shape determining unit Receiving information from at least one of the preamble coding sequence analysis unit and the preamble audio decoding unit, determining a temporal envelope shape of the decoded audio signal based on the information, and a time envelope correction unit based on the pre-recorded time envelope shape The time envelope shape determined by the determination unit is used to correct the time envelope shape of the audio signal that has been decoded beforehand and output it.

The sound decoding device according to the second aspect is a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and is characterized in that: the code sequence inverse multiplexing unit includes a pre-recorded The coded sequence of the encoded audio signal is at least divided into: a code sequence containing information of the low frequency signal of the previously recorded audio signal, and a code sequence containing information of the high frequency signal of the previously recorded audio signal; and a low frequency The decoding unit receives a code sequence containing the information of the encoded low frequency signal from the pre-recording sequence inverse multiplexing unit, and obtains a low-frequency signal by decoding; and the high-frequency decoding unit is inversely multiplexed from the pre-coded sequence. And at least one of the low-frequency decoding unit and the pre-recording low-frequency decoding unit, the first information is generated, and the high-frequency signal is generated based on the first information; and the low-frequency time envelope shape determining unit is configured to decode the low-frequency decoding from the pre-recording sequence and the low-frequency decoding. At least one of the departments receives the second information, and based on the second information, determines the time envelope of the decoded low frequency signal And the low-frequency time envelope correction unit corrects the time envelope shape of the low-frequency signal that has been decoded before and outputs it based on the time envelope shape determined by the pre-recorded low-frequency envelope shape determining unit; and the low-frequency/high-frequency signal synthesis The low frequency signal is corrected by the low frequency time envelope correction unit, and the low frequency signal whose time envelope shape has been corrected is received. The high frequency decoding unit receives the high frequency signal, and the low frequency signal whose pre-recorded time envelope shape has been corrected is combined with the high frequency signal. To get the sound signal to be output.

The sound decoding device according to the third aspect is a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and is characterized in that it includes a coding sequence inverse multiplexing unit, which is included before Decoding at least the coded sequence of the encoded audio signal into a code sequence containing information of a low frequency signal of the previously recorded audio signal, and a code sequence containing information of the high frequency signal of the previously recorded audio signal; And the low-frequency decoding unit receives the code sequence containing the information of the low-frequency signal that has been encoded from the pre-recording sequence inverse multiplexing unit, and obtains the low-frequency signal by decoding; and the high-frequency decoding unit is inversely multiplied from the pre-coded sequence. At least one of the industrialization department and the low-frequency decoding unit receives the first information, generates a high-frequency signal based on the first information, and the high-frequency time envelope shape determining unit is an inverse multiplexing unit from the pre-recorded coding sequence. At least one of the low-frequency decoding unit and the pre-recorded high-frequency decoding unit receives the second information, determines the time envelope shape of the generated high-frequency signal based on the second information, and the high-frequency time envelope correction unit. The time envelope of the high-frequency signal that has been generated by the pre-recording is corrected based on the time envelope shape determined by the pre-recorded high-frequency envelope shape determining unit. And the low-frequency/high-frequency signal synthesis unit receives the low-frequency signal from the low-frequency decoding unit, and receives the high-frequency signal whose time envelope shape has been corrected from the high-frequency time envelope correction unit, and the low-frequency signal and the pre-recorded low-frequency signal The pre-recorded time envelope shape is synthesized by the modified high-frequency signal to obtain the sound signal to be output.

The sound decoding device according to the fourth aspect is a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and is characterized in that it includes an encoding sequence inverse multiplexing unit, which includes a pre-recorded The coded sequence of the encoded audio signal is at least divided into: a code sequence containing information of the low frequency signal of the previously recorded audio signal, and a code sequence containing information of the high frequency signal of the previously recorded audio signal. And a low-frequency decoding unit that receives a coded sequence containing information of a low-frequency signal that has been encoded from a pre-recording sequence inverse multiplexing unit, and obtains a low-frequency signal by decoding; and a high-frequency decoding unit, which is a pre-coded sequence At least one of the inverse multiplexing unit and the low-frequency decoding unit receives the first information, generates a high-frequency signal based on the first information, and the low-frequency envelope shape determining unit is an inverse multiplexing unit from the preceding coding sequence And at least one of the low-frequency decoding units, the second information is received, and the time envelope shape of the decoded low-frequency signal is determined based on the second information; and the low-frequency time envelope correction unit is based on the pre-recorded low-frequency time envelope. The time envelope shape determined by the shape determining unit is used to correct and output the time envelope shape of the low-frequency signal that has been decoded before; and the high-frequency time envelope shape determining unit is derived from the pre-recording sequence inverse multiplex part and the pre-recording low-frequency decoding. At least one of the ministry and the pre-recorded high-frequency decoding unit receives the third information, and determines that the third information has been generated based on the third information. The time envelope shape of the frequency signal; and the high-frequency time envelope correction unit corrects the time envelope shape of the high-frequency signal that has been generated by the pre-recorded high-frequency envelope shape determining unit based on the time envelope shape determined by the pre-recorded high-frequency envelope shape determining unit And the low frequency/high frequency signal synthesizing unit receives the low frequency signal whose time envelope shape has been corrected from the low frequency time envelope correction unit, and receives the high frequency signal whose time envelope shape has been corrected from the high frequency time envelope correction unit. The low-frequency signal whose pre-recorded envelope shape has been corrected is combined with the high-frequency signal whose pre-recorded time envelope shape has been corrected to obtain an audio signal to be output.

Further, in the audio decoding device according to the second or fourth aspect, the pre-recording high-frequency decoding unit may be reversed from the pre-recorded coding sequence. At least one of the technicalization unit, the pre-recorded low-frequency decoding unit, and the pre-recorded low-frequency time envelope correction unit receives information, and generates a high-frequency signal based on the information.

Further, in the audio decoding device according to the first to fourth aspects, the pre-recorded high-frequency envelope correction unit may be based on the time envelope shape determined by the pre-recorded high-frequency envelope shape determining unit. Correcting the time envelope shape of the intermediate signal when the high frequency signal is generated in the high frequency decoding unit; the high frequency decoding unit is configured to generate the residual high frequency signal by using the intermediate signal before the time envelope shape has been corrected. Processing.

Here, the high-frequency decoding unit may include an analysis filter unit that collects a low-frequency signal decoded by the low-frequency decoding unit, divides the signal into sub-band signals, and a high-frequency signal generating unit. And using at least a sub-band signal divided by the pre-analysis filter unit to generate a high-frequency signal; and a frequency envelope adjustment unit for adjusting a frequency envelope of the high-frequency signal generated by the pre-recorded high-frequency signal generating unit; It is a high frequency signal generated by the high frequency signal generating unit.

The invention of the sound decoding device according to the first to fourth aspects described above can be regarded as an invention of the sound decoding method, and can be described as follows.

The sound decoding method according to the first aspect is a sound decoding method executed by a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and is characterized in that: a coding sequence analysis step is provided The encoding sequence containing the audio signal encoded beforehand is parsed; and the sound decoding step is to receive the parsed encoded sequence containing the audio signal encoded in the preamble, and decode and obtain the audio signal. And a time envelope shape determining step of collecting information obtained by at least one of a pre-coding sequence analysis step and a pre-recording sound decoding step, and determining a time envelope shape of the decoded audio signal based on the information And the time envelope correction step is based on the time envelope shape determined by the pre-recorded envelope shape determining step, and corrects the time envelope shape of the pre-recorded audio signal and outputs it.

The sound decoding method according to the second aspect is a sound decoding method executed by a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and is characterized in that the encoding sequence is inversely multiplexed. And dividing the code sequence containing the audio signal encoded in the preamble into at least a code sequence containing information of the low frequency signal of the previously recorded audio signal, and information including the high frequency signal of the previously recorded audio signal. And the low-frequency decoding step, which is to receive the coded sequence containing the information of the low-frequency signal that has been encoded before, and obtain the low-frequency signal by decoding; and the high-frequency decoding step is to reverse the pre-coded sequence. The first information obtained by at least one of the industrialization step and the low-frequency decoding step is charged, and the high-frequency signal is generated based on the first information; and the low-frequency time envelope shape determining step is to inversely multiply the pre-coded sequence The second information obtained by at least one of the step of converting and the low-frequency decoding step is charged. The second information is used to determine the time envelope shape of the decoded low frequency signal; and the low frequency time envelope correction step is based on the time envelope shape determined by the pre-recorded low frequency envelope shape determining step to correct the predecessor decoded. The time envelope shape of the low frequency signal is output and output; and the low frequency/high frequency signal synthesis step The low frequency signal obtained by the pre-recording low-frequency time envelope correction step is corrected, and the high-frequency signal obtained by the high-frequency decoding step is charged, and the envelope shape of the pre-recording time has been corrected. The low frequency signal is combined with the preamble high frequency signal to obtain an audio signal to be output.

The sound decoding method according to the third aspect is a sound decoding method executed by a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and is characterized in that the encoding sequence is inversely multiplexed. And dividing the code sequence containing the audio signal encoded in the preamble into at least a code sequence containing information of the low frequency signal of the previously recorded audio signal, and information including the high frequency signal of the previously recorded audio signal. And the low-frequency decoding step, which is to receive the coded sequence containing the information of the low-frequency signal that has been encoded before, and obtain the low-frequency signal by decoding; and the high-frequency decoding step is to reverse the pre-coded sequence. The first information obtained by at least one of the industrialization step and the low-frequency decoding step is charged, and the high-frequency signal is generated based on the first information; and the high-frequency time envelope shape determining step is to reverse the pre-coding sequence Obtained by at least one of a chemicalization step, a pre-recording low-frequency decoding step, and a pre-recording high-frequency decoding step 2 information, to be charged, based on the second information, to determine the time envelope shape of the generated high frequency signal; and the high frequency time envelope correction step based on the time determined by the pre-recorded high frequency time envelope shape determining step Envelope shape to correct the time envelope shape of the high frequency signal that has been generated beforehand and output it; and the low frequency/high frequency signal synthesis step, which is obtained by the low frequency decoding step The low-frequency signal is collected, and the high-frequency signal whose shape has been corrected before the high-frequency time envelope correction step is obtained is collected, and the low-frequency signal of the pre-recorded time and the high-frequency signal whose shape has been corrected is synthesized. To get the sound signal to be output.

The sound decoding method according to the fourth aspect is a sound decoding method performed by a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and is characterized in that the encoding sequence is inversely multiplexed. The code sequence containing the pre-recorded audio signal is divided into at least a code sequence containing information of the low-frequency signal of the previously recorded audio signal, and a code containing information of the high-frequency signal of the previously recorded audio signal. The sequence and the low-frequency decoding step are performed by taking the code sequence of the information of the low-frequency signal that has been encoded before the reverse multiplexing step of the pre-coded sequence is obtained, and decoding is performed to obtain a low-frequency signal; and the high-frequency decoding step is performed. And acquiring, by the first information obtained by at least one of the pre-multiplexing step and the low-frequency decoding step, generating a high-frequency signal based on the first information; and determining a low-frequency time envelope shape determining step The second capital obtained by at least one of the pre-complexing sequence reverse multiplexing step and the pre-recording low-frequency decoding step The signal is received, based on the second information, to determine the time envelope shape of the decoded low frequency signal; and the low frequency time envelope correction step is based on the time envelope shape determined by the pre-recorded low frequency envelope shape determining step. Correcting the time envelope shape of the low frequency signal that has been decoded before and outputting; and the high frequency time envelope shape determining step, which is at least one of an inverse multiplexing step, a low frequency decoding step, and a high frequency decoding step. In one case, the third information is received, and the time envelope shape of the generated high frequency signal is determined based on the third information; and the high frequency time envelope correction step is determined based on the pre-recorded high frequency time envelope shape determining step. The time envelope shape is used to correct the time envelope shape of the high frequency signal that has been generated beforehand and output; and the low frequency/high frequency signal synthesis step is to correct the time envelope shape obtained before the low frequency time envelope correction step is obtained. The low-frequency signal is charged, and the high-frequency signal whose shape has been corrected before the time envelope of the high-frequency time envelope is obtained is charged, and the shape of the low-frequency signal and the pre-recorded time envelope of the pre-recorded envelope shape has been corrected. The high frequency signals are synthesized to obtain an audio signal to be output.

Further, the invention of the sound decoding device according to the first to fourth aspects described above can be regarded as an invention of a sound decoding program, and can be described as follows.

The sound decoding program according to the first aspect is a computer for providing a sound decoding device that decodes an encoded audio signal and outputs an audio signal. The code sequence analysis unit includes The encoding sequence of the encoded audio signal is preliminarily analyzed, and the audio decoding unit receives the encoded sequence including the audio signal encoded in the preamble from the preamble encoding sequence analysis unit, and decodes the obtained audio signal; and obtains the audio signal; and the time envelope The shape determining unit receives information from at least one of the preamble coding sequence analysis unit and the preamble audio decoding unit, and determines a time envelope shape of the decoded audio signal based on the information; and the time envelope correction unit is based on Determined by the envelope of the time envelope shape decision The time envelope shape is determined to correct the time envelope shape of the previously decoded audio signal and output it.

The sound decoding program according to the second aspect is configured to cause a computer provided in a sound decoding device that decodes an encoded audio signal to output an audio signal to function as a code sequence inverse multiplexing unit. Separating at least a code sequence containing a pre-recorded audio signal into a code sequence containing information of a low-frequency signal of a previously recorded audio signal, and information including a high-frequency signal of the previously recorded audio signal. a code sequence; and a low-frequency decoding unit that receives a code sequence containing information of a low-frequency signal that has been encoded from a pre-coded sequence inverse multiplex unit, and obtains a low-frequency signal by decoding; and a high-frequency decoding unit, which is a pre-coded code At least one of the sequence inverse multiplexing unit and the pre-recording low-frequency decoding unit receives the first information, generates a high-frequency signal based on the first information, and the low-frequency time envelope shape determining unit is inversely multiplexed from the pre-coded sequence At least one of the ministry and the pre-recorded low-frequency decoding unit receives the second information, and determines the decoded low-frequency signal based on the second information. The time envelope shape and the low-frequency time envelope correction unit correct the time envelope shape of the low-frequency signal that has been decoded before and output based on the time envelope shape determined by the pre-recorded low-frequency envelope shape determining unit; and the low frequency/ The high-frequency signal synthesizing unit receives the low-frequency signal whose time envelope shape has been corrected from the low-frequency time envelope correction unit, and receives the high-frequency signal from the high-frequency decoding unit, and the low-frequency signal and the pre-recorded height of the pre-recorded time envelope shape are corrected. The frequency signals are synthesized to obtain an audio signal to be output.

The sound decoding program described in the third aspect is used to The computer provided in the sound decoding device that decodes the encoded audio signal and outputs the audio signal functions as: the code sequence inverse multiplexing unit divides the code sequence containing the audio signal encoded beforehand into at least : a code sequence containing information of a low frequency signal of a previously recorded audio signal, and a code sequence containing information of a high frequency signal of the previously recorded audio signal; and a low frequency decoding section for inverse multiplexing from the preamble coding sequence The Ministry of Information collects a code sequence containing information of the encoded low frequency signal for decoding, and obtains a low frequency signal; and the high frequency decoding unit is at least one of an inverse multiplexed part of the preamble coding sequence and a low frequency decoding part of the preamble And receiving the first information, generating the high frequency signal based on the first information; and the high frequency time envelope shape determining unit, wherein the high frequency decoding unit is the reverse encoding unit, the low frequency decoding unit, and the high frequency decoding unit. At least one of the second information is received, and based on the second information, the time envelope shape of the generated high frequency signal is determined; The high-frequency time envelope correction unit corrects and outputs a time envelope shape of the high-frequency signal generated by the pre-recorded high-frequency envelope shape determining unit based on the time envelope shape determined by the pre-recorded high-frequency envelope shape determining unit; and the low-frequency/high-frequency signal The synthesizing unit receives the low-frequency signal from the low-frequency decoding unit, and receives the high-frequency signal whose time envelope shape has been corrected from the high-frequency time envelope correction unit, and performs the high-frequency signal whose pre-recorded low-frequency signal and the pre-recorded time envelope shape have been corrected. Synthesize to get the sound signal to be output.

The sound decoding program according to the fourth aspect is used to cause the computer provided in the sound decoding device that decodes the encoded audio signal to output an audio signal to function as: the coding sequence is inversely multiplexed. For example, the code sequence containing the pre-recorded audio signal is at least divided into a code sequence containing information of the low-frequency signal of the previously recorded audio signal, and a high-frequency signal containing the previously recorded audio signal. a low-frequency decoding unit that receives a code sequence containing information of a low-frequency signal that has been encoded from a pre-recorded sequence inverse multiplexing unit, and obtains a low-frequency signal by decoding; and a high-frequency decoding unit At least one of the pre-recording sequence inverse multiplexer and the pre-recording low-frequency decoding unit receives the first information, generates a high-frequency signal based on the first information, and the low-frequency time envelope shape determining unit is inversely multi-coded from the pre-coded sequence At least one of the Ministry of Industrialization and the low-frequency decoding unit of the preamble receives the second information, determines the temporal envelope shape of the decoded low-frequency signal based on the second information, and the low-frequency time envelope correction unit is based on the pre-recorded The time envelope shape determined by the low-frequency time envelope shape determining unit to correct the time envelope of the low-frequency signal that has been decoded beforehand And the high-frequency time envelope shape determining unit receives the third information from at least one of the pre-recording sequence inverse multiplexing unit, the pre-recording low-frequency decoding unit, and the pre-recording high-frequency decoding unit, based on the 3 information to determine the time envelope shape of the generated high-frequency signal; and the high-frequency time envelope correction unit based on the time envelope shape determined by the pre-recorded high-frequency envelope shape determining unit to correct the pre-record has been generated The time envelope shape of the high frequency signal is output and the low frequency/high frequency signal synthesizing unit receives the low frequency signal whose time envelope shape has been corrected from the low frequency time envelope correction unit, and collects the time from the high frequency time envelope correction unit. The high-frequency signal whose envelope shape has been corrected, the low-frequency signal and the pre-recorded time envelope shape of the pre-recorded time envelope shape have been corrected. The modified high frequency signal is synthesized to obtain an audio signal to be output.

In order to achieve the above object, the applicant invented the voice encoding device described in the following first to fourth aspects.

The voice encoding device according to the first aspect is a voice encoding device that encodes an input audio signal and outputs a coded sequence, and includes a voice encoding unit for encoding a pre-recorded audio signal. And the time envelope information coding unit calculates the time envelope information of the pre-recorded audio signal and encodes it; and the code sequence multiplex part includes the code sequence of the previously recorded audio signal obtained by the pre-recorded audio coding unit, and the pre-recorded time envelope. The coding sequence of the time envelope information obtained by the information coding department is multiplexed.

The voice encoding device according to the second aspect is a voice encoding device that encodes an input audio signal and outputs a coded sequence, and is characterized in that the low-frequency encoding unit includes a low-frequency component of a pre-recorded audio signal. And the high-frequency encoding unit encodes the high-frequency component of the pre-recorded audio signal; and the low-frequency time envelope information encoding unit is based on the pre-recorded audio signal, the encoding result of the low-frequency encoding unit, and the low-frequency encoding process. The at least one of the obtained information is used to calculate and encode the time envelope information of the low frequency component; and the coding sequence multiplexing section includes the coding sequence of the low frequency component obtained by the low frequency coding unit and the coding sequence. The code sequence of the high-frequency component obtained by the high-frequency encoding unit and the time envelope information of the low-frequency component obtained by the low-frequency time envelope information encoding unit are multiplexed.

The sound encoding device described in the third aspect belongs to the office A voice encoding device that encodes an input audio signal and outputs a coded sequence, comprising: a low frequency encoding unit that encodes a low frequency component of a preamble audio signal; and a high frequency encoding unit that uses a preamble audio signal The high-frequency component is encoded; and the high-frequency time envelope information encoding unit is based on the pre-recorded audio signal, the encoding result of the low-frequency encoding section, the information obtained during the low-frequency encoding process, the encoding result of the high-frequency encoding section, and The at least one of the information obtained during the high frequency encoding process is used to calculate and encode the time envelope information of the high frequency component; and the coding sequence multiplexing section is to receive the low frequency encoding portion obtained by the low frequency encoding portion. The coding sequence of the component and the coding sequence of the high-frequency component obtained by the high-frequency coding unit and the time envelope information of the high-frequency component obtained by the high-frequency time envelope coding unit are multiplexed. .

The voice encoding device according to the fourth aspect is a voice encoding device that encodes an input audio signal and outputs a coded sequence, and is characterized in that the low-frequency encoding unit includes a low-frequency component of a pre-recorded audio signal. And the high-frequency encoding unit encodes the high-frequency component of the pre-recorded audio signal; and the low-frequency time envelope information encoding unit is based on the pre-recorded audio signal, the encoding result of the low-frequency encoding unit, and the low-frequency encoding process. The at least one of the obtained information is used to calculate and encode the time envelope information of the low frequency component; and the high frequency time envelope information coding unit is based on the preamble sound signal, the encoding result of the low frequency encoding section, and the low frequency encoding process. Information obtained in the middle, the encoding result of the high frequency encoding part, and the information obtained during the high frequency encoding process At least one of the above is used to calculate and encode the time envelope information of the high frequency component; and the coding sequence multiplexing section includes the coding sequence of the low frequency component obtained by the low frequency coding section and the high frequency coding containing the preamble. The encoding sequence of the high-frequency component and the encoding sequence of the time envelope information of the low-frequency component obtained by the low-frequency time envelope information encoding unit and the time of the high-frequency component obtained by the high-frequency time envelope information encoding unit are obtained. The coding sequence of the envelope information is multiplexed.

The invention of the voice encoding device according to the first to fourth aspects described above can be regarded as an invention of the voice encoding method, and can be described as follows.

The voice coding method according to the first aspect is a voice coding method performed by a voice coding device that encodes an input audio signal and outputs a coding sequence, and is characterized in that: a voice coding step is provided The pre-recorded audio signal is encoded; and the time envelope information encoding step is to calculate and encode the temporal envelope information of the pre-recorded audio signal; and the coding sequence multiplexing step is to encode the pre-recorded audio signal obtained by the pre-recorded audio coding step. The coding sequence of the time envelope information obtained by the sequence and the pre-recording time envelope information encoding step is multiplexed.

The voice encoding method according to the second aspect is a voice encoding method performed by a voice encoding device that encodes an input audio signal and outputs a coded sequence, and is characterized in that: a low frequency encoding step is provided The low-frequency component of the audio signal is encoded; and the high-frequency encoding step encodes the high-frequency component of the pre-recorded audio signal; and the low-frequency time envelope information encoding step is based on the pre-recorded audio signal and the low note The at least one of the encoding result of the frequency encoding step and the information obtained during the low frequency encoding process is used to calculate and encode the temporal envelope information of the low frequency component; and the encoding sequence multiplexing step includes the low frequency encoding of the preamble a coding sequence of a low-frequency component, a coding sequence containing a high-frequency component obtained by a high-frequency encoding step, and a time envelope information of a low-frequency component obtained by a pre-recording low-frequency envelope information encoding step, To be more multiplexed.

The audio coding method according to the third aspect is a voice coding method performed by a voice coding device that encodes an input audio signal and outputs a coding sequence, and is characterized in that: a low frequency coding step is provided The low-frequency component of the audio signal is encoded; and the high-frequency encoding step encodes the high-frequency component of the pre-recorded audio signal; and the high-frequency time envelope information encoding step is based on the encoding result of the pre-recorded audio signal and the pre-recorded low-frequency encoding step. Calculating and encoding the time envelope information of the high frequency component by at least one of the information obtained during the low frequency encoding process, the encoding result of the high frequency encoding step, and the information obtained during the high frequency encoding process. And the coding sequence multiplexing step, which comprises the coding sequence of the low frequency component obtained before the low frequency coding step, and the coding sequence of the high frequency component obtained by the high frequency coding step, and the high frequency time envelope. a coding sequence of time envelope information of high frequency components obtained by the information encoding step, To be multiplexed.

The voice coding method according to the fourth aspect is a voice coding method performed by a voice coding device that encodes an input audio signal and outputs a code sequence, and is characterized in that: a low frequency coding step is provided. The low-frequency component of the pre-recorded audio signal is encoded; and the high-frequency encoding step encodes the high-frequency component of the pre-recorded audio signal; and the low-frequency time envelope information encoding step is based on the pre-recorded audio signal and the pre-recorded low-frequency encoding. Based on at least one of the coding result of the step and the information obtained during the low-frequency encoding process, the time envelope information of the low-frequency component is calculated and encoded; and the high-frequency time envelope information encoding step is based on the pre-recorded audio signal, pre-record The high frequency component is calculated by at least one of the encoding result of the low frequency encoding step, the information obtained during the low frequency encoding process, the encoding result of the high frequency encoding step, and the information obtained during the high frequency encoding process. The time envelope information is encoded and encoded; and the coding sequence multiplexing step is to include a code sequence of the low frequency component obtained before the low frequency coding step, and a code sequence of the high frequency component obtained by the high frequency coding step. And the low frequency obtained by the pre-recording low-frequency time envelope information encoding step Min temporal envelope information coding sequence, referred to before, and a high-frequency temporal envelope of the high-frequency component obtained by the information encoding step of the coding sequence of the temporal envelope information, to be of multiplexing.

Further, the invention of the voice encoding device according to the first to fourth aspects described above can be regarded as an invention of a voice encoding program, and can be described as follows.

The voice coding program according to the first aspect is a computer that is provided in a voice coding device that encodes an input audio signal and outputs a code sequence. The voice coding unit is used to: The pre-recorded audio signal is encoded; and the time envelope information coding unit calculates the time envelope information of the pre-recorded audio signal and encodes it; and the coding sequence The column multi-processing unit multiplexes the code sequence including the coded sequence of the previously recorded audio signal obtained by the pre-recorded audio coding unit and the time envelope information obtained by the pre-recorded time envelope information coding unit.

The audio coding program according to the second aspect is a computer for providing a sound encoding device that encodes an input audio signal and outputs a coded sequence. The low frequency encoding unit is a low frequency encoding unit. The low-frequency component of the signal is encoded; and the high-frequency encoding unit encodes the high-frequency component of the pre-recorded audio signal; and the low-frequency time envelope information encoding unit is based on the pre-recorded audio signal, the encoding result of the low-frequency encoding section, and The at least one of the information obtained during the low frequency encoding process is used to calculate and encode the temporal envelope information of the low frequency component; and the coding sequence multiplexing section includes the low frequency component obtained by the low frequency encoding section. The coding sequence and the coding sequence including the coding sequence of the high-frequency component obtained by the high-frequency coding unit and the time envelope information of the low-frequency component obtained by the low-frequency time envelope coding unit are multiplexed.

The audio coding program according to the third aspect is a computer for providing a sound encoding device that encodes an input audio signal and outputs a coded sequence. The low frequency encoding unit is a low frequency encoding unit. The low-frequency component of the signal is encoded; and the high-frequency encoding unit encodes the high-frequency component of the pre-recorded audio signal; and the high-frequency time envelope information encoding unit is based on the encoding result of the pre-recorded audio signal and the pre-recorded low-frequency encoding unit. The information obtained during the low frequency encoding process, the encoding result of the high frequency encoding section, and the information obtained during the high frequency encoding process. At least one of the above is used to calculate and encode the time envelope information of the high frequency component; and the coding sequence multiplexing section includes the coding sequence of the low frequency component obtained by the low frequency coding section and the high frequency coding containing the preamble. The coded sequence of the high-frequency component and the time envelope information of the high-frequency component obtained by the high-frequency time envelope information encoding unit are obtained by the ministry.

The audio coding program according to the fourth aspect is a computer for providing a sound encoding device that encodes an input audio signal and outputs a coded sequence. The low frequency encoding unit is a low frequency encoding unit. The low-frequency component of the signal is encoded; and the high-frequency encoding unit encodes the high-frequency component of the pre-recorded audio signal; and the low-frequency time envelope information encoding unit is based on the pre-recorded audio signal, the encoding result of the low-frequency encoding section, and The time envelope information of the low frequency component is calculated and encoded by at least one of the information obtained during the low frequency encoding process; and the high frequency time envelope information encoding section is based on the encoding result of the pre-recorded audio signal and the pre-recorded low-frequency encoding section. Calculating and encoding the time envelope information of the high frequency component by at least one of the information obtained during the low frequency encoding process, the encoding result of the high frequency encoding section, and the information obtained during the high frequency encoding process. And the coding sequence multiplexing part, which will contain the low frequency encoding part obtained before the low frequency encoding a coding sequence of the component, a coding sequence containing the previously recorded high frequency component obtained by the high frequency coding unit, and a time envelope information of the low frequency component obtained by the low frequency temporal envelope coding unit, and a preamble high frequency envelope. The coding sequence of the time envelope information of the high-frequency component obtained by the information coding unit is multiplexed.

In order to achieve the above object, the applicant also invented the sound decoding device described in the fifth and sixth aspects below.

The sound decoding device according to the fifth aspect is a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and is characterized in that the code sequence reverse multiplexing unit includes a pre-recorded The coded sequence of the encoded audio signal is at least divided into: a code sequence containing information of the low frequency signal of the previously recorded audio signal, and a code sequence containing information of the high frequency signal of the previously recorded audio signal; and a low frequency The decoding unit receives a code sequence containing the information of the encoded low frequency signal from the pre-recording sequence inverse multiplexing unit, and obtains a low-frequency signal by decoding; and the high-frequency decoding unit is inversely multiplexed from the pre-coded sequence. At least one of the part and the low-frequency decoding unit receives information, generates a high-frequency signal based on the information, and the time envelope shape determining unit is an inverse multi-processing unit, a low-frequency decoding unit, and a high-frequency high-frequency decoding unit. At least one of the decoding units receives information to determine the time envelope of the decoded low frequency signal and the generated high frequency signal And a low-frequency time envelope correction unit that corrects and outputs a time envelope shape of the low-frequency signal that has been decoded before, based on the time envelope shape determined by the pre-recorded time envelope shape determining unit; and the high-frequency time envelope correction unit Based on the time envelope shape determined by the pre-recorded envelope shape determining unit, the time envelope shape of the high-frequency signal generated by the pre-recording is corrected and output; and the low-frequency/high-frequency signal synthesizing unit is recorded from the low frequency time. The envelope correction unit receives the low frequency signal whose time envelope has been corrected, and receives the high frequency signal whose time envelope has been corrected from the high frequency time envelope correction unit, and the sound to be outputted The signals are synthesized.

The sound decoding device according to the sixth aspect is a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and is characterized in that: the code sequence inverse multiplexing unit includes a pre-recorded The coded sequence of the encoded audio signal is at least divided into: a code sequence containing information of the low frequency signal of the previously recorded audio signal, and a code sequence containing information of the high frequency signal of the previously recorded audio signal; and a low frequency The decoding unit receives a code sequence containing the information of the encoded low frequency signal from the pre-recording sequence inverse multiplexing unit, and obtains a low-frequency signal by decoding; and the high-frequency decoding unit is inversely multiplexed from the pre-coded sequence. At least one of the part and the low-frequency decoding unit receives information, generates a high-frequency signal based on the information, and the time envelope shape determining unit is an inverse multi-processing unit, a low-frequency decoding unit, and a high-frequency high-frequency decoding unit. At least one of the decoding units receives information to determine the time envelope of the decoded low frequency signal and the generated high frequency signal The shape and the time envelope correction unit receive the decoded low-frequency signal from the low-frequency decoding unit, and receive the generated high-frequency signal from the high-frequency decoding unit, based on the time determined by the pre-recorded envelope shape determining unit. The shape of the envelope is corrected and outputted by the low-frequency signal of the pre-recorded low-frequency signal and the high-frequency signal of the pre-recorded high-frequency signal; and the low-frequency/high-frequency signal synthesis unit receives the time envelope from the previous time envelope correction unit. The corrected low frequency signal and high frequency signal are combined to synthesize the sound signal to be output.

Further, in the audio decoding device according to the fifth aspect, the pre-recording high-frequency decoding unit may be inversely multiplexed from the pre-coded sequence. At least one of the part, the pre-recorded low-frequency decoding unit, and the pre-recorded low-frequency time envelope correction unit receives information, and generates a high-frequency signal based on the information.

Further, in the audio decoding device according to the fifth aspect, the pre-recorded high-frequency envelope correction unit may correct the pre-recorded high-frequency based on the time envelope shape determined by the pre-recorded time envelope shape determining unit. The time envelope shape of the intermediate signal when the high frequency signal is generated in the decoding unit; the high frequency decoding unit performs the process of generating the residual high frequency signal by using the intermediate signal before the time envelope shape is corrected.

Further, in the audio decoding device according to the sixth aspect, the pre-recording high-frequency decoding unit may receive information from at least one of the pre-coded sequence inverse multiplexing unit and the pre-recording low-frequency decoding unit, based on the Information to generate high frequency signals.

Further, in the audio decoding device according to the sixth aspect, the pre-recording time envelope correcting unit may correct the pre-recording high-frequency decoding unit based on the time envelope shape determined by the pre-recorded time envelope shape determining unit. The time envelope shape of the intermediate signal when the high frequency signal is generated; the high frequency decoding unit performs the process of generating the residual high frequency signal by using the intermediate signal before the time envelope shape has been corrected.

Here, the high-frequency decoding unit may include an analysis filter unit that collects a low-frequency signal decoded by the low-frequency decoding unit, divides the signal into sub-band signals, and a high-frequency signal generating unit. At least the sub-band signal divided by the pre-analysis filter unit is used to generate the high-frequency signal; and the frequency envelope adjustment unit adjusts the frequency envelope of the high-frequency signal generated by the pre-recorded high-frequency signal generating unit; The number is a high frequency signal generated by the high frequency signal generating unit.

The invention of the sound decoding device according to the fifth and sixth aspects described above can be regarded as an invention of the sound decoding method, and can be described as follows.

The sound decoding method according to the fifth aspect is a sound decoding method executed by a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and is characterized in that: a coding sequence inverse multiplexing step is provided And dividing the code sequence containing the audio signal encoded in the preamble into at least a code sequence containing information of the low frequency signal of the previously recorded audio signal, and information including the high frequency signal of the previously recorded audio signal. And the low-frequency decoding step, which is to receive the coded sequence containing the information of the low-frequency signal that has been encoded before, and obtain the low-frequency signal by decoding; and the high-frequency decoding step is to reverse the pre-coded sequence. The information obtained by at least one of the industrialization step and the pre-recording low-frequency decoding step is charged, and the high-frequency signal is generated based on the information; and the time envelope shape determining step is to reverse the multiplex processing step and the pre-recording low frequency of the pre-recording sequence. Information obtained by at least one of a decoding step and a pre-recording high-frequency decoding step Receiving, determining the time envelope shape of the decoded low frequency signal and the generated high frequency signal; and the low frequency time envelope correction step based on the time envelope shape determined by the predecessor time envelope shape determining step to correct the predecessor The time envelope shape of the decoded low frequency signal is output and the high frequency time envelope correction step is based on the time envelope shape determined by the predecessor time envelope shape determining step to correct the time of the high frequency signal that has been generated beforehand. Envelope shape and output; and low frequency / high frequency signal synthesis steps, the system will be low The time envelope obtained by the frequency envelope correction step is received by the corrected low frequency signal, and the time envelope obtained by the high frequency time envelope correction step is charged and the high frequency signal is corrected, and the audio signals to be output are combined.

The sound decoding method according to the sixth aspect is a sound decoding method executed by a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and is characterized in that: the encoding sequence inverse multiplexing step is provided And dividing the code sequence containing the audio signal encoded in the preamble into at least a code sequence containing information of the low frequency signal of the previously recorded audio signal, and information including the high frequency signal of the previously recorded audio signal. And the low-frequency decoding step, which is to receive the coded sequence containing the information of the low-frequency signal that has been encoded before, and obtain the low-frequency signal by decoding; and the high-frequency decoding step is to reverse the pre-coded sequence. The information obtained by at least one of the industrialization step and the pre-recording low-frequency decoding step is charged, and the high-frequency signal is generated based on the information; and the time envelope shape determining step is to reverse the multiplex processing step and the pre-recording low frequency of the pre-recording sequence. Information obtained by at least one of a decoding step and a pre-recording high-frequency decoding step Receiving, determining the time envelope shape of the decoded low frequency signal and the generated high frequency signal; and the time envelope correction step, which is to collect the decoded low frequency signal obtained by the low frequency decoding step, and to record the high frequency The generated high frequency signal obtained by the decoding step is collected, based on the time envelope shape determined by the pre-recorded envelope shape determining step, and the time of the low frequency signal that has been decoded and the time of the high frequency signal that has been generated is recorded. The envelope shape is corrected and The output and the low-frequency/high-frequency signal synthesizing step are performed by collecting the low-frequency signal and the high-frequency signal whose time envelope obtained by the pre-recording time envelope correction step is corrected, and synthesizing the sound signals to be output.

Further, the invention of the sound decoding device according to the fifth and sixth aspects described above can be regarded as an invention of a sound decoding program, and can be described as follows.

The sound decoding program according to the fifth aspect is configured to cause a computer provided in a sound decoding device that decodes an encoded audio signal to output an audio signal to function as a coding sequence inverse multiplexing unit. Separating at least a code sequence containing a pre-recorded audio signal into a code sequence containing information of a low-frequency signal of a previously recorded audio signal, and information including a high-frequency signal of the previously recorded audio signal. a code sequence; and a low-frequency decoding unit that receives a code sequence containing information of a low-frequency signal that has been encoded from a pre-coded sequence inverse multiplex unit, and obtains a low-frequency signal by decoding; and a high-frequency decoding unit, which is a pre-coded code At least one of the sequence inverse multiplexing unit and the pre-recording low-frequency decoding unit receives information, generates a high-frequency signal based on the information, and the time envelope shape determining unit is an inverse multiplexing unit and a low-frequency decoding unit. And at least one of the pre-recorded high-frequency decoding units receives information, determines the low-frequency signal that has been decoded, and the generated high-frequency The time envelope shape of the signal; and the low-frequency time envelope correction unit corrects the time envelope shape of the low-frequency signal that has been decoded before and outputs it based on the time envelope shape determined by the pre-recorded envelope shape determining unit; The time envelope correction unit is based on the time determined by the pre-recorded envelope shape determining unit. The shape of the envelope is used to correct the time envelope shape of the high-frequency signal that has been generated beforehand and output it; and the low-frequency/high-frequency signal synthesis unit receives the low-frequency signal whose time envelope has been corrected from the low-frequency time envelope correction unit. The high frequency time envelope correction unit receives the high frequency signal whose time envelope has been corrected, and synthesizes the audio signals to be output.

The sound decoding program according to the sixth aspect is configured to cause a computer provided in a sound decoding device that decodes an encoded audio signal to output an audio signal to function as a code sequence inverse multiplexing unit. Separating at least a code sequence containing a pre-recorded audio signal into a code sequence containing information of a low-frequency signal of a previously recorded audio signal, and information including a high-frequency signal of the previously recorded audio signal. a code sequence; and a low-frequency decoding unit that receives a code sequence containing information of a low-frequency signal that has been encoded from a pre-coded sequence inverse multiplex unit, and obtains a low-frequency signal by decoding; and a high-frequency decoding unit, which is a pre-coded code At least one of the sequence inverse multiplexing unit and the pre-recording low-frequency decoding unit receives information, generates a high-frequency signal based on the information, and the time envelope shape determining unit is an inverse multiplexing unit and a low-frequency decoding unit. And at least one of the pre-recorded high-frequency decoding units receives information, determines the low-frequency signal that has been decoded, and the generated high-frequency The time envelope shape of the signal; and the time envelope correction unit receives the low frequency signal that has been decoded from the low frequency decoding unit, and receives the generated high frequency signal from the high frequency decoding unit, based on the envelope shape determining unit that has been previously recorded. The determined time envelope shape is corrected and outputted by the low-frequency signal of the pre-recorded low-frequency signal and the high-frequency signal of the pre-recorded high-frequency signal; and the low-frequency/high-frequency signal The synthesizing unit collects the low-frequency signal and the high-frequency signal whose time envelope has been corrected from the previous time envelope correction unit, and synthesizes the audio signals to be output.

The amount of information can be corrected to reduce the temporal envelope shape of the decoded signal and to alleviate the perceived distortion.

1, 10, 11, 12, 13, 14, 15, 15A, 16, 17, 18, 18A, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 190A, 300, 310, 320, 320A, 330, 340, 350, 350A, 360, 370, 380, 390‧‧‧ voice decoding device

1a, 10d, 13c‧‧‧ Code Sequence Analysis Department

1b‧‧‧Sound Decoding Department

1c, 16f, 120f, 360b‧‧‧ Time Envelope Shape Determination Department

1d, 13a, 13b, 14a, 15a, 15aA, 16c, 17a, 18a, 18aA, 300a, 300aA, 360a, 360aA, 370a, 370aA, 380a, 380aA‧‧‧ Time Envelope Correction Section

2, 20, 20A, 21, 22, 23, 24, 25, 26, 27, 28, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 400, 410, 420, 430, 440, 450‧‧‧ voice coding device

2a‧‧‧Sound Coding Department

2b, 20g, 20gA, 21a, 21aA, 22b, 22bA, 22bB, 23a, 23aA, 24c, 25b, 26a, 26aA, 27a, 28a, 270b, 280a, 290a, 400a, 410a, 420a ‧ ‧ time envelope information coding unit

2c, 20h, 200d, 210b, 220b, 250b, 250c, 270c‧‧‧ coding sequence multiplexing department

10a, 10aA, 100a, 110a, 120a, 150a, 170a‧‧‧ code sequence inverse multiplex part

10b‧‧‧Core Decoding Department

10c, 20c, 20c1‧‧‧ analysis filter unit

10e, 10eA, 10eB, 10eC, 16b, 100c, 120c‧‧‧ low frequency time envelope shape determining unit

10f, 12a, 16e, 100d, 120e‧‧‧ low frequency time envelope correction unit

10g‧‧‧High Frequency Signal Generation Department

10h‧‧‧Decoding/Inverse Quantization Department

10i, 25a‧‧‧ Frequency Envelope Adjustment Department

10j, 170c‧‧‧ Synthesis Filter Group

13a, 13aA, 13aB, 13aC, 14b, 16a, 16d, 110b, 120b, 120bA‧‧‧ high frequency time envelope shape determining unit

20a‧‧‧ Downsampling Department

20b‧‧‧ Core Coding Department

20d‧‧‧Control Parameter Coding Department

20e, 270d‧‧‧ envelope calculation department

20f‧‧‧Quantity/Coding Department

20i‧‧‧Core Decoding Signal Generation Department

20j, 24b‧‧‧ subband signal power calculation unit

22a, 22a1, 22aB‧‧‧ Time Envelope Calculation Unit

24a, 410b‧‧‧like high frequency signal generation

100b‧‧‧Low Frequency Decoding Department

100e, 110e, 130b‧‧‧ High Frequency Decoding Department

100f, 150c‧‧‧ Low Frequency/High Frequency Signal Synthesis Department

110c, 120d, 130a, 140a, 140b‧‧‧ high frequency time envelope correction unit

150b, 170b‧‧‧ switch group

200a‧‧‧Low Frequency Coding Department

200b‧‧‧High Frequency Coding Department

200c‧‧‧Low Time Envelope Information Coding Department

210a, 220a, 230a‧‧‧ High-frequency signal generation control information coding department

250a, 270a‧‧‧ High-frequency signal generation control information coding department

360b‧‧‧Time Envelope Decision Department

Fig. 1 is a view showing the configuration of a sound decoding device 10 according to the first embodiment.

Fig. 2 is a flowchart showing the operation of the sound decoding device 10 according to the first embodiment.

Fig. 3 is a view showing the configuration of the speech encoding device 20 according to the first embodiment.

Fig. 4 is a flowchart showing the operation of the speech encoding device 20 according to the first embodiment.

[Fig. 5] A diagram showing the configuration of a first modification 10A of the speech decoding device according to the first embodiment.

Fig. 6 is a flowchart showing the operation of the first modification 10A of the speech decoding device according to the first embodiment.

[Fig. 7] A diagram showing the configuration of a second modification 10B of the speech decoding device according to the first embodiment.

Fig. 8 is a third variation of the sound decoding device according to the first embodiment. An illustration of the composition of Example 10C.

FIG. 9 is a view showing a configuration of a first modification 20A of the speech encoding device according to the first embodiment.

FIG. 10 is a flowchart showing the operation of the first modification 20A of the speech encoding device according to the first embodiment.

Fig. 11 is a view showing the configuration of the sound decoding device 11 according to the second embodiment.

Fig. 12 is a flowchart showing the operation of the sound decoding device 11 according to the second embodiment.

Fig. 13 is a view showing the configuration of the speech encoding device 21 according to the second embodiment.

Fig. 14 is a flowchart showing the operation of the speech encoding device 21 according to the second embodiment.

[Fig. 15] A diagram showing the configuration of a first modification 21A of the speech encoding device according to the second embodiment.

Fig. 16 is a flowchart showing the operation of the first modification 21A of the speech encoding device according to the second embodiment.

Fig. 17 is a view showing the configuration of the sound decoding device 12 according to the third embodiment.

Fig. 18 is a flowchart showing the operation of the sound decoding device 12 according to the third embodiment.

Fig. 19 is a view showing the configuration of the speech encoding device 22 according to the third embodiment.

[Fig. 20] Operation of the speech encoding device 22 according to the third embodiment Flow chart.

[Fig. 21] A diagram showing the configuration of a first modification 22A of the speech encoding device according to the third embodiment.

FIG. 22 is a flowchart showing the operation of the first modification 22A of the speech encoding device according to the third embodiment.

[Fig. 23] A diagram showing the configuration of a second modification 22B of the speech encoding device according to the third embodiment.

Fig. 24 is a flowchart showing the operation of the first modification 22B of the speech encoding device according to the third embodiment.

Fig. 25 is a view showing the configuration of the sound decoding device 13 according to the fourth embodiment.

Fig. 26 is a flowchart showing the operation of the sound decoding device 13 according to the fourth embodiment.

Fig. 27 is a view showing the configuration of the speech encoding device 23 according to the fourth embodiment.

Fig. 28 is a flowchart showing the operation of the speech encoding device 23 according to the fourth embodiment.

[Fig. 29] A diagram showing the configuration of a first modification 13A of the speech decoding device according to the fourth embodiment.

FIG. 30 is a flowchart showing the operation of the first modification 13A of the speech decoding device according to the fourth embodiment.

[Fig. 31] A diagram showing the configuration of a second modification 13B of the speech decoding device according to the fourth embodiment.

Fig. 32 is a third variation of the sound decoding device according to the fourth embodiment. An illustration of the composition of Example 13C.

[Fig. 33] A diagram showing the configuration of a first modification 23A of the speech encoding device according to the fourth embodiment.

FIG. 34 is a flowchart showing the operation of the first modification 23A of the speech encoding device according to the fourth embodiment.

Fig. 35 is a diagram showing the configuration of the sound decoding device 14 according to the fifth embodiment.

Fig. 36 is a flowchart showing the operation of the sound decoding device 14 according to the fifth embodiment.

Fig. 37 is a diagram showing the configuration of the speech encoding device 24 according to the fifth embodiment.

Fig. 38 is a flow chart showing the operation of the speech encoding device 24 according to the fifth embodiment.

[Fig. 39] A diagram showing the configuration of a first modification 14A of the speech decoding device according to the fifth embodiment.

FIG. 40 is a flowchart showing the operation of the first modification 14A of the speech decoding device according to the fifth embodiment.

Fig. 41 is a diagram showing the configuration of the sound decoding device 15 according to the sixth embodiment.

Fig. 42 is a flowchart showing the operation of the sound decoding device 15 according to the sixth embodiment.

Fig. 43 is a view showing the configuration of the speech encoding device 25 according to the sixth embodiment.

[Fig. 44] Operation of the speech encoding device 25 according to the sixth embodiment Flow chart.

[Fig. 45] A diagram showing the configuration of a first modification 15A of the speech decoding device according to the sixth embodiment.

Fig. 46 is a flowchart showing the operation of the first modification 15A of the speech decoding device according to the sixth embodiment.

Fig. 47 is a diagram showing the configuration of the sound decoding device 16 according to the seventh embodiment.

Fig. 48 is a flow chart showing the operation of the sound decoding device according to the seventh embodiment.

Fig. 49 is a diagram showing the configuration of the speech encoding device 26 according to the seventh embodiment.

Fig. 50 is a flowchart showing the operation of the speech encoding device 26 according to the seventh embodiment.

[Fig. 51] A diagram showing the configuration of a first modification 16A of the speech decoding device according to the seventh embodiment.

[Fig. 52] A flowchart showing the operation of the first modification 16A of the speech decoding device according to the seventh embodiment.

[Fig. 53] A diagram showing the configuration of a first modification 26A of the speech encoding device according to the seventh embodiment.

Fig. 54 is a flowchart showing the operation of the first modification 26A of the speech encoding device according to the seventh embodiment.

Fig. 55 is a diagram showing the configuration of the sound decoding device 17 according to the eighth embodiment.

[Fig. 56] Flow of the operation of the sound decoding device according to the eighth embodiment Cheng Tu.

Fig. 57 is a diagram showing the configuration of the speech encoding device 27 according to the eighth embodiment.

Fig. 58 is a flowchart showing the operation of the speech encoding device 27 according to the eighth embodiment.

Fig. 59 is a diagram showing the configuration of the sound decoding device 18 according to the ninth embodiment.

Fig. 60 is a flowchart showing the operation of the sound decoding device according to the ninth embodiment.

Fig. 61 is a diagram showing the configuration of the speech encoding device 28 according to the ninth embodiment.

Fig. 62 is a flowchart showing the operation of the speech encoding device 28 according to the ninth embodiment.

[Fig. 63] A diagram showing the configuration of a first modification 18A of the speech decoding device according to the ninth embodiment.

[Fig. 64] Fig. 64 is a flowchart showing the operation of the first modification 18A of the speech decoding device according to the ninth embodiment.

Fig. 65 is a diagram showing the configuration of the sound decoding device 1 according to the tenth embodiment.

Fig. 66 is a flowchart showing the operation of the sound decoding device according to the tenth embodiment.

Fig. 67 is a diagram showing the configuration of the speech encoding device 2 according to the tenth embodiment.

[Fig. 68] Operation of the speech encoding device 2 according to the tenth embodiment Flow chart.

Fig. 69 is a diagram showing the configuration of the sound decoding device 100 according to the eleventh embodiment.

Fig. 70 is a flowchart showing the operation of the sound decoding device according to the eleventh embodiment.

Fig. 71 is a diagram showing the configuration of the speech encoding device 200 according to the eleventh embodiment.

Fig. 72 is a flowchart showing the operation of the speech encoding device 200 according to the eleventh embodiment.

[Fig. 73] A diagram showing the configuration of a first modification 100A of the speech decoding device according to the eleventh embodiment.

Fig. 74 is a flowchart showing the operation of the first modification 100A of the speech decoding device according to the eleventh embodiment.

[Fig. 75] A diagram showing the configuration of a first modification 100A of the speech encoding device according to the eleventh embodiment.

Fig. 76 is a diagram showing the configuration of the sound decoding device 110 according to the twelfth embodiment.

Fig. 77 is a flowchart showing the operation of the sound decoding device according to the twelfth embodiment.

Fig. 78 is a diagram showing the configuration of the speech encoding device 210 according to the twelfth embodiment.

Fig. 79 is a flowchart showing the operation of the speech encoding device 210 according to the twelfth embodiment.

[Fig. 80] Structure of the sound decoding device 120 according to the thirteenth embodiment An illustration of the formation.

Fig. 81 is a flowchart showing the operation of the sound decoding device 120 according to the thirteenth embodiment.

Fig. 82 is a diagram showing the configuration of the speech encoding device 220 according to the thirteenth embodiment.

Fig. 83 is a flowchart showing the operation of the speech encoding device 220 according to the thirteenth embodiment.

[Fig. 84] A diagram showing the configuration of a first modification 120A of the speech decoding device according to the thirteenth embodiment.

[Fig. 85] A flowchart showing the operation of the first modification 120A of the speech decoding device according to the thirteenth embodiment.

[Fig. 86] A diagram showing the configuration of a second modification 120B of the speech decoding device according to the thirteenth embodiment.

[Fig. 87] A flowchart showing the operation of the second modification 120B of the speech decoding device according to the thirteenth embodiment.

Fig. 88 is a diagram showing the configuration of the sound decoding device 130 according to the fourteenth embodiment.

Fig. 89 is a flowchart showing the operation of the sound decoding device according to the fourteenth embodiment.

Fig. 90 is a diagram showing the configuration of the speech encoding device 230 according to the fourteenth embodiment.

Fig. 91 is a flowchart showing the operation of the speech encoding device 230 according to the fourteenth embodiment.

[FIG. 92] The structure of the sound decoding device 140 according to the fifteenth embodiment An illustration of the formation.

Fig. 93 is a flowchart showing the operation of the sound decoding device according to the fifteenth embodiment.

Fig. 94 is a diagram showing the configuration of the speech encoding device 240 according to the fifteenth embodiment.

Fig. 95 is a flowchart showing the operation of the speech encoding device 240 according to the fifteenth embodiment.

[Fig. 96] A diagram showing the configuration of a first modification 140A of the speech decoding device according to the fifteenth embodiment.

Fig. 97 is a flowchart showing the operation of the first modification 140A of the speech decoding device according to the fifteenth embodiment.

[Fig. 98] A diagram showing the configuration of a second modification 140B of the speech decoding device according to the fifteenth embodiment.

Fig. 99 is a diagram showing the configuration of a speech decoding device 150 according to the sixteenth embodiment.

Fig. 100 is a flowchart showing the operation of the sound decoding device according to the sixteenth embodiment.

Fig. 101 is a diagram showing the configuration of the speech encoding device 250 according to the sixteenth embodiment.

Fig. 102 is a flowchart showing the operation of the speech encoding device 250 according to the sixteenth embodiment.

[Fig. 103] A diagram showing the configuration of a first modification 150A of the speech decoding device according to the sixteenth embodiment.

[Fig. 104] The first variation of the speech decoding device according to the sixteenth embodiment Flowchart of the action of the form 150A.

[Fig. 105] A diagram showing the configuration of a second modification 150B of the speech decoding device according to the sixteenth embodiment.

Fig. 106 is a diagram showing the configuration of the sound decoding device 160 according to the seventeenth embodiment.

Fig. 107 is a flowchart showing the operation of the sound decoding device according to the seventeenth embodiment.

Fig. 108 is a diagram showing the configuration of the speech encoding device 260 according to the seventeenth embodiment.

Fig. 109 is a flowchart showing the operation of the speech encoding device 260 according to the seventeenth embodiment.

[Fig. 110] A diagram showing the configuration of a first modification 160A of the speech decoding device according to the seventeenth embodiment.

[Fig. 111] A flowchart showing the operation of the first modification 160A of the speech decoding device according to the seventeenth embodiment.

[Fig. 112] A diagram showing the configuration of a second modification 160B of the speech decoding device according to the seventeenth embodiment.

Fig. 113 is a diagram showing the configuration of the sound decoding device 170 according to the eighteenth embodiment.

Fig. 114 is a flow chart showing the operation of the sound decoding device according to the eighteenth embodiment.

Fig. 115 is a diagram showing the configuration of the speech encoding device 270 according to the eighteenth embodiment.

[Fig. 116] Movement of the speech encoding device 270 according to the eighteenth embodiment The flow chart.

FIG. 117 is a diagram showing the configuration of the sound decoding device 180 according to the nineteenth embodiment.

Fig. 118 is a flowchart showing the operation of the sound decoding device according to the nineteenth embodiment.

Fig. 119 is a diagram showing the configuration of the speech encoding device 280 according to the nineteenth embodiment.

Fig. 120 is a flowchart showing the operation of the speech encoding device 280 according to the nineteenth embodiment.

Fig. 121 is a diagram showing the configuration of a sound decoding device 190 according to a twentieth embodiment.

Fig. 122 is a flowchart showing the operation of the sound decoding device according to the twentieth embodiment.

Fig. 123 is a diagram showing the configuration of the speech encoding device 290 according to the twentieth embodiment.

Fig. 124 is a flowchart showing the operation of the speech encoding device 290 according to the twentieth embodiment.

Fig. 125 is a diagram showing the configuration of the sound decoding device 300 according to the twenty-first embodiment.

Fig. 126 is a flowchart showing the operation of the speech decoding apparatus according to the twenty-first embodiment.

Fig. 127 is a diagram showing the configuration of the speech encoding device 400 according to the twenty-first embodiment.

[Fig. 128] Motion of the speech encoding apparatus 400 according to the twenty-first embodiment The flow chart.

FIG. 129 is a diagram showing the configuration of the audio decoding device 310 according to the twenty-second embodiment.

Fig. 130 is a flowchart showing the operation of the sound decoding device according to the twenty-second embodiment.

Fig. 131 is a diagram showing the configuration of the speech encoding device 410 according to the twenty-second embodiment.

Fig. 132 is a flowchart showing the operation of the speech encoding device 410 according to the twenty-second embodiment.

Fig. 133 is a diagram showing the configuration of the speech decoding device 320 according to the twenty-third embodiment.

Fig. 134 is a flowchart showing the operation of the sound decoding device according to the twenty-third embodiment.

Fig. 135 is a diagram showing the configuration of the speech encoding device 420 according to the twenty-third embodiment.

Fig. 136 is a flowchart showing the operation of the speech encoding device 420 according to the twenty-third embodiment.

FIG. 137 is a diagram showing the configuration of the audio decoding device 320A according to the first modification of the twenty-third embodiment.

FIG. 138 is a flowchart showing the operation of the sound decoding device 320A according to the first modification of the twenty-third embodiment.

Fig. 139 is a diagram showing the configuration of the sound decoding device 330 according to the twenty-fourth embodiment.

[Fig. 140] Operation of the sound decoding device according to the twenty-fourth embodiment flow chart.

Fig. 141 is a diagram showing the configuration of the speech encoding device 430 according to the twenty-fourth embodiment.

Fig. 142 is a flowchart showing the operation of the speech encoding device 430 according to the twenty-fourth embodiment.

Fig. 143 is a diagram showing the configuration of the sound decoding device 340 according to the twenty-fifth embodiment.

Fig. 144 is a flowchart showing the operation of the speech decoding apparatus according to the twenty-fifth embodiment.

Fig. 145 is a diagram showing the configuration of the speech encoding device 440 according to the twenty-fifth embodiment.

Fig. 146 is a flowchart showing the operation of the speech encoding device 440 according to the twenty-fifth embodiment.

Fig. 147 is a diagram showing the configuration of the speech decoding device 350 according to the twenty-sixth embodiment.

Fig. 148 is a flowchart showing the operation of the speech decoding apparatus according to the twenty-sixth embodiment.

Fig. 149 is a diagram showing the configuration of the speech encoding device 450 according to the twenty-sixth embodiment.

Fig. 150 is a flowchart showing the operation of the speech encoding device 450 according to the twenty-sixth embodiment.

FIG. 151 is a diagram showing the configuration of the sound decoding device 350A according to the first modification of the twenty-sixth embodiment.

[Fig. 152] Sound decoding described in the first modification of the twenty sixth embodiment Flowchart of the action of device 350A.

Fig. 153 is a diagram showing the configuration of a second modification 16B of the speech decoding device according to the seventh embodiment.

FIG. 154 is a flowchart showing the operation of the second modification 16B of the speech decoding device according to the seventh embodiment.

FIG. 155 is a diagram showing a configuration of a third modification 16C of the speech decoding device according to the seventh embodiment.

FIG. 156 is a flowchart showing the operation of the third modification 16C of the speech decoding device according to the seventh embodiment.

FIG. 157 is a diagram showing a configuration of a fourth modification 16D of the speech decoding device according to the seventh embodiment.

FIG. 158 is a flowchart showing the operation of the fourth modification 16D of the speech decoding device according to the seventh embodiment.

Fig. 159 is a diagram showing the configuration of a fifth modification 16E of the speech decoding device according to the seventh embodiment.

[FIG. 160] A flowchart of the operation of the fifth modification 16E of the speech decoding device according to the seventh embodiment.

Fig. 161 is a diagram showing the configuration of a first modification 17A of the speech decoding device according to the eighth embodiment.

FIG. 162 is a flowchart showing the operation of the first modification 17A of the speech decoding device according to the eighth embodiment.

Fig. 163 is a diagram showing the configuration of a second modification 17B of the speech decoding device according to the eighth embodiment.

[Fig. 164] The second variation of the speech decoding device according to the eighth embodiment Flowchart of the action of the example 17B.

Fig. 165 is a diagram showing the configuration of a third modification 17C of the speech decoding device according to the eighth embodiment.

Fig. 166 is a flowchart showing the operation of a third modification 17C of the speech decoding device according to the eighth embodiment.

Fig. 167 is a diagram showing the configuration of a fourth modification 17D of the speech decoding device according to the eighth embodiment.

Fig. 168 is a flowchart showing the operation of the fourth modification 17D of the speech decoding device according to the eighth embodiment.

Fig. 169 is a diagram showing the configuration of a second modification 18B of the speech decoding device according to the ninth embodiment.

Fig. 170 is a flowchart showing the operation of the second modification 18B of the speech decoding device according to the ninth embodiment.

Fig. 171 is a diagram showing the configuration of a third modification 18C of the speech decoding device according to the ninth embodiment.

FIG. 172 is a flowchart showing the operation of the third modification 18C of the speech decoding device according to the ninth embodiment.

Fig. 173 is a diagram showing the configuration of a fourth modification 18D of the speech decoding device according to the ninth embodiment.

Fig. 174 is a flowchart showing the operation of the fourth modification 18D of the speech decoding device according to the ninth embodiment.

Fig. 175 is a diagram showing the configuration of a fifth modification 18E of the speech decoding device according to the ninth embodiment.

[Fig. 176] The fifth variation of the speech decoding device according to the ninth embodiment Flowchart of the action of the form 18E.

Fig. 177 is a diagram showing the configuration of a sixth modification 18F of the speech decoding device according to the ninth embodiment.

FIG. 178 is a flowchart showing the operation of the sixth modification 18F of the speech decoding device according to the ninth embodiment.

Fig. 179 is a diagram showing the configuration of a seventh modification 18G of the speech decoding device according to the ninth embodiment.

Fig. 180 is a flowchart showing the operation of a seventh modification 18G of the speech decoding device according to the ninth embodiment.

Fig. 181 is a diagram showing the configuration of an eighth modification 18H of the speech decoding device according to the ninth embodiment.

Fig. 182 is a flowchart showing the operation of the eighth modification 18H of the speech decoding device according to the ninth embodiment.

Fig. 183 is a diagram showing the configuration of a ninth modification 18I of the speech decoding device according to the ninth embodiment.

Fig. 184 is a flowchart showing the operation of the ninth modification 18I of the speech decoding device according to the ninth embodiment.

Fig. 185 is a diagram showing the configuration of a third modification 120C of the speech decoding device according to the thirteenth embodiment.

FIG. 186 is a flowchart showing the operation of a third modification 120C of the speech decoding device according to the thirteenth embodiment.

Fig. 187 is a diagram showing the configuration of a fourth modification 120D of the speech decoding device according to the thirteenth embodiment.

[Fig. 188] The fourth variation of the voice decoding device according to the thirteenth embodiment Flowchart of the action of the form 120D.

FIG. 189 is a diagram showing the configuration of a fifth modification 120E of the speech decoding device according to the thirteenth embodiment.

Fig. 190 is a flowchart showing the operation of a fifth modification 120E of the speech decoding device according to the thirteenth embodiment.

FIG. 191 is a diagram showing the configuration of a sixth modification 120F of the speech decoding device according to the thirteenth embodiment.

Fig. 192 is a flowchart showing the operation of the sixth modification 120F of the speech decoding device according to the thirteenth embodiment.

Fig. 193 is a diagram showing the configuration of a seventh modification 120G of the speech decoding device according to the thirteenth embodiment.

Fig. 194 is a flowchart showing the operation of the seventh modification 120G of the speech decoding device according to the thirteenth embodiment.

Fig. 195 is a diagram showing the configuration of an eighth modification 120H of the speech decoding device according to the thirteenth embodiment.

Fig. 196 is a flowchart showing the operation of the eighth modification 120H of the speech decoding device according to the thirteenth embodiment.

FIG. 197 is a diagram showing the configuration of a ninth modification 1201 of the speech decoding device according to the thirteenth embodiment.

Fig. 198 is a flowchart showing the operation of the ninth modification 120I of the speech decoding device according to the thirteenth embodiment.

Fig. 199 is a diagram showing the configuration of a tenth modification 120J of the speech decoding device according to the thirteenth embodiment.

[Fig. 200] 10th of the voice decoding device according to the thirteenth embodiment Flowchart of the operation of Modification 120J.

Fig. 201 is a diagram showing the configuration of an eleventh modification 120K of the speech decoding device according to the thirteenth embodiment.

[Fig. 202] A flowchart showing the operation of the eleventh modification 120K of the speech decoding device according to the thirteenth embodiment.

Fig. 203 is a diagram showing the configuration of a twelfth modification 120L of the speech decoding device according to the thirteenth embodiment.

Fig. 204 is a flowchart showing the operation of the twelfth modification 120L of the speech decoding device according to the thirteenth embodiment.

Fig. 205 is a diagram showing the configuration of a thirteenth modification 120M of the speech decoding device according to the thirteenth embodiment.

Fig. 206 is a flowchart showing the operation of a thirteenth modification 120M of the speech decoding device according to the thirteenth embodiment.

Fig. 207 is a diagram showing the configuration of a fourteenth modification 120N of the speech decoding device according to the thirteenth embodiment.

FIG. 208 is a flowchart showing the operation of the fourteenth modification 120N of the speech decoding device according to the thirteenth embodiment.

FIG. 209 is a diagram showing a configuration of a third modification 140C of the speech decoding device according to the fifteenth embodiment.

Fig. 210 is a flowchart showing the operation of a third modification 140C of the speech decoding device according to the fifteenth embodiment.

FIG. 211 is a diagram showing the configuration of a fourth modification 140D of the speech decoding device according to the fifteenth embodiment.

[Fig. 212] The fourth variation of the speech decoding device according to the fifteenth embodiment Flowchart of the action of the shape 140D.

Fig. 213 is a diagram showing the configuration of a fifth modification 140E of the speech decoding device according to the fifteenth embodiment.

Fig. 214 is a flowchart showing the operation of a fifth modification 140E of the speech decoding device according to the fifteenth embodiment.

FIG. 215 is a diagram showing the configuration of a sixth modification 140F of the speech decoding device according to the fifteenth embodiment.

Fig. 216 is a flowchart showing the operation of the sixth modification 140F of the speech decoding device according to the fifteenth embodiment.

Fig. 217 is a diagram showing the configuration of a seventh modification 140G of the speech decoding device according to the fifteenth embodiment.

FIG. 218 is a flowchart showing the operation of the seventh modification 140G of the speech decoding device according to the fifteenth embodiment.

Fig. 219 is a diagram showing the configuration of an eighth modification 140H of the speech decoding device according to the fifteenth embodiment.

Fig. 220 is a flowchart showing the operation of the eighth modification 140H of the speech decoding device according to the fifteenth embodiment.

Fig. 221 is a diagram showing the configuration of a ninth modification 140I of the speech decoding device according to the fifteenth embodiment.

Fig. 222 is a flowchart showing the operation of a ninth modification 140I of the speech decoding device according to the fifteenth embodiment.

Fig. 223 is a diagram showing the configuration of a tenth modification 140J of the speech decoding device according to the fifteenth embodiment.

[Fig. 224] 10th of the voice decoding device according to the fifteenth embodiment A flowchart of the operation of the modification 140J.

Fig. 225 is a diagram showing the configuration of an eleventh modification 140K of the speech decoding device according to the fifteenth embodiment.

Fig. 226 is a flowchart showing the operation of the eleventh modification 140K of the speech decoding device according to the fifteenth embodiment.

Fig. 227 is a diagram showing the configuration of a twelfth modification 140L of the speech decoding device according to the fifteenth embodiment.

FIG. 228 is a flowchart showing the operation of the twelfth modification 140L of the speech decoding device according to the fifteenth embodiment.

FIG. 229 is a diagram showing the configuration of a thirteenth modification 140M of the speech decoding device according to the fifteenth embodiment.

Fig. 230 is a flowchart showing the operation of a thirteenth modification 140M of the speech decoding device according to the fifteenth embodiment.

Fig. 231 is a diagram showing the configuration of a fourteenth modification 140N of the speech decoding device according to the fifteenth embodiment.

Fig. 232 is a flowchart showing the operation of the fourteenth modification 140N of the speech decoding device according to the fifteenth embodiment.

FIG. 233 is a diagram showing the configuration of a third modification 150C of the speech decoding device according to the sixteenth embodiment.

FIG. 234 is a flowchart showing the operation of a third modification 150C of the speech decoding device according to the sixteenth embodiment.

FIG. 235 is a diagram showing a configuration of a fourth modification 150D of the speech decoding device according to the sixteenth embodiment.

[Fig. 236] The fourth variation of the speech decoding device according to the sixteenth embodiment Flowchart of the action of the form 150D.

FIG. 237 is a diagram showing a configuration of a fifth modification 150E of the speech decoding device according to the sixteenth embodiment.

FIG. 238 is a flowchart showing the operation of a fifth modification 150E of the speech decoding device according to the sixteenth embodiment.

FIG. 239 is a diagram showing the configuration of a sixth modification 150F of the speech decoding device according to the sixteenth embodiment.

Fig. 240 is a flowchart showing the operation of the sixth modification 150F of the speech decoding device according to the sixteenth embodiment.

Fig. 241 is a diagram showing the configuration of a seventh modification 150G of the speech decoding device according to the sixteenth embodiment.

FIG. 242 is a flowchart showing the operation of the seventh modification 150G of the speech decoding device according to the sixteenth embodiment.

Fig. 243 is a diagram showing the configuration of an eighth modification 150H of the speech decoding device according to the sixteenth embodiment.

Fig. 244 is a flowchart showing the operation of the eighth modification 150H of the speech decoding device according to the sixteenth embodiment.

Fig. 245 is a diagram showing the configuration of a ninth modification 150I of the speech decoding device according to the sixteenth embodiment.

Fig. 246 is a flowchart showing the operation of the ninth modification 150I of the speech decoding device according to the sixteenth embodiment.

Fig. 247 is a diagram showing the configuration of a tenth modification 150J of the speech decoding device according to the sixteenth embodiment.

[Fig. 248] 10th of the voice decoding device according to the 16th embodiment Flowchart of the operation of the modification 150J.

Fig. 249 is a diagram showing the configuration of an eleventh modification 150K of the speech decoding device according to the sixteenth embodiment.

Fig. 250 is a flowchart showing the operation of the eleventh modification 150K of the speech decoding device according to the sixteenth embodiment.

Fig. 251 is a diagram showing the configuration of a twelfth modification 150L of the speech decoding device according to the sixteenth embodiment.

FIG. 252 is a flowchart showing the operation of the twelfth modification 150L of the speech decoding device according to the sixteenth embodiment.

Fig. 253 is a diagram showing the configuration of a thirteenth modification 150M of the speech decoding device according to the sixteenth embodiment.

Fig. 254 is a flowchart showing the operation of the thirteenth modification 150M of the speech decoding device according to the sixteenth embodiment.

Fig. 255 is a diagram showing the configuration of a fourteenth modification 150N of the speech decoding device according to the sixteenth embodiment.

Fig. 256 is a flowchart showing the operation of the fourteenth modification 150N of the speech decoding device according to the sixteenth embodiment.

FIG. 257 is a diagram showing the configuration of a third modification 160C of the speech decoding device according to the seventeenth embodiment.

FIG. 258 is a flowchart showing the operation of the third modification 160C of the speech decoding device according to the seventeenth embodiment.

FIG. 259 is a diagram showing the configuration of a fourth modification 160D of the speech decoding device according to the seventeenth embodiment.

[Fig. 260] The fourth variation of the speech decoding device according to the seventeenth embodiment Flowchart of the action of the shape 160D.

Fig. 261 is a diagram showing the configuration of a fifth modification 160E of the speech decoding device according to the seventeenth embodiment.

Fig. 262 is a flowchart showing the operation of a fifth modification 160E of the speech decoding device according to the seventeenth embodiment.

FIG. 263 is a diagram showing a configuration of a sixth modification 160F of the speech decoding device according to the seventeenth embodiment.

Fig. 264 is a flowchart showing the operation of the sixth modification 160F of the speech decoding device according to the seventeenth embodiment.

Fig. 265 is a diagram showing the configuration of a seventh modification 160G of the speech decoding device according to the seventeenth embodiment.

FIG. 266 is a flowchart showing the operation of the seventh modification 160G of the speech decoding device according to the seventeenth embodiment.

FIG. 267 is a diagram showing the configuration of an eighth modification 160H of the speech decoding device according to the seventeenth embodiment.

FIG. 268 is a flowchart showing the operation of the eighth modification 160H of the speech decoding device according to the seventeenth embodiment.

Fig. 269 is a diagram showing the configuration of a ninth modification 160I of the speech decoding device according to the seventeenth embodiment.

Fig. 270 is a flowchart showing the operation of the ninth modification 160I of the speech decoding device according to the seventeenth embodiment.

Fig. 271 is a diagram showing the configuration of a tenth modification 160J of the speech decoding device according to the seventeenth embodiment.

[Fig. 272] 10th of the voice decoding device according to the 17th embodiment Flowchart of the operation of the modification 160J.

FIG. 273 is a diagram showing the configuration of an eleventh modification 160K of the speech decoding device according to the seventeenth embodiment.

Fig. 274 is a flowchart showing the operation of the eleventh modification 160K of the speech decoding device according to the seventeenth embodiment.

FIG. 275 is a diagram showing the configuration of a twelfth modification 160L of the speech decoding device according to the seventeenth embodiment.

Fig. 276 is a flowchart showing the operation of the twelfth modification 160L of the speech decoding device according to the seventeenth embodiment.

Fig. 277 is a diagram showing the configuration of a thirteenth modification 160M of the speech decoding device according to the seventeenth embodiment.

FIG. 278 is a flowchart showing the operation of the thirteenth modification 160M of the speech decoding device according to the seventeenth embodiment.

FIG. 279 is a diagram showing the configuration of a fourteenth modification 160N of the speech decoding device according to the seventeenth embodiment.

FIG. 280 is a flowchart showing the operation of the fourteenth modification 160N of the speech decoding device according to the seventeenth embodiment.

FIG. 281 is a diagram showing the configuration of a first modification 170A of the speech decoding device according to the eighteenth embodiment.

FIG. 282 is a flowchart showing the operation of the first modification 170A of the speech decoding device according to the eighteenth embodiment.

FIG. 283 is a diagram showing the configuration of a second modification 170B of the speech decoding device according to the eighteenth embodiment.

[Fig. 284] The second variation of the speech decoding device according to the eighteenth embodiment Flowchart of the action of the form 170B.

FIG. 285 is a diagram showing the configuration of a third modification 170C of the speech decoding device according to the eighteenth embodiment.

FIG. 286 is a flowchart showing the operation of a third modification 170C of the speech decoding device according to the eighteenth embodiment.

FIG. 287 is a diagram showing the configuration of a fourth modification 170D of the speech decoding device according to the eighteenth embodiment.

FIG. 288 is a flowchart showing the operation of the fourth modification 170D of the speech decoding device according to the eighteenth embodiment.

FIG. 289 is a diagram showing the configuration of a first modification 180A of the speech decoding device according to the nineteenth embodiment.

FIG. 290 is a flowchart showing the operation of the first modification 180A of the speech decoding device according to the nineteenth embodiment.

FIG. 291 is a diagram showing the configuration of a second modification 180B of the speech decoding device according to the nineteenth embodiment.

FIG. 292 is a flowchart showing the operation of the second modification 180B of the speech decoding device according to the nineteenth embodiment.

FIG. 293 is a diagram showing the configuration of a third modification 180C of the speech decoding device according to the nineteenth embodiment.

FIG. 294 is a flowchart showing the operation of the third modification 180C of the speech decoding device according to the nineteenth embodiment.

FIG. 295 is a diagram showing the configuration of a fourth modification 180D of the speech decoding device according to the nineteenth embodiment.

[Fig. 296] The fourth variation of the voice decoding device according to the nineteenth embodiment Flowchart of the action of the form 180D.

FIG. 297 is a diagram showing the configuration of a first modification 190A of the speech decoding device according to the twentieth embodiment.

FIG. 298 is a flowchart showing the operation of the first modification 190A of the speech decoding device according to the twentieth embodiment.

FIG. 299 is a diagram showing the configuration of a second modification 190B of the speech decoding device according to the twentieth embodiment.

[Fig. 300] A flowchart showing the operation of the second modification 190B of the speech decoding device according to the twentieth embodiment.

FIG. 301 is a diagram showing a configuration of a third modification 190C of the speech decoding device according to the twentieth embodiment.

[Fig. 302] A flowchart showing the operation of the third modification 190C of the speech decoding device according to the twentieth embodiment.

Fig. 303 is a diagram showing the configuration of a fourth modification 190D of the speech decoding device according to the twentieth embodiment.

[Fig. 304] A flowchart showing the operation of the fourth modification 190D of the speech decoding device according to the twentieth embodiment.

FIG. 305 is a diagram showing a configuration of a fifth modification 190E of the speech decoding device according to the twentieth embodiment.

Fig. 306 is a flowchart showing the operation of a fifth modification 190E of the speech decoding device according to the twentieth embodiment.

Fig. 307 is a diagram showing the configuration of a sixth modification 190F of the speech decoding device according to the twentieth embodiment.

[Fig. 308] The sixth variation of the speech decoding device according to the twentieth embodiment Flowchart of the action of the form 190F.

FIG. 309 is a diagram showing the configuration of a seventh modification 190G of the speech decoding device according to the twentieth embodiment.

Fig. 310 is a flowchart showing the operation of a seventh modification 190G of the speech decoding device according to the twentieth embodiment.

Fig. 311 is a diagram showing the configuration of an eighth modification 190H of the speech decoding device according to the twentieth embodiment.

FIG. 312 is a flowchart showing the operation of the eighth modification 190H of the speech decoding device according to the twentieth embodiment.

Fig. 313 is a diagram showing the configuration of a ninth modification 190I of the speech decoding device according to the twentieth embodiment.

Fig. 314 is a flowchart showing the operation of a ninth modification 190I of the speech decoding device according to the twentieth embodiment.

FIG. 315 is a diagram showing the configuration of a first modification 300A of the speech decoding device according to the twenty-first embodiment.

FIG. 316 is a flowchart showing the operation of the first modification 300A of the speech decoding device according to the twenty-first embodiment.

[Fig. 317] A diagram showing the configuration of a second modification 300B of the speech decoding device according to the twenty-first embodiment.

FIG. 318 is a flowchart showing the operation of the second modification 300B of the speech decoding device according to the twenty-first embodiment.

FIG. 319 is a diagram showing a configuration of a third modification 300C of the speech decoding device according to the twenty-first embodiment.

[Fig. 320] The third variation of the speech decoding device according to the twenty-first embodiment Flowchart of the action of the form 300C.

FIG. 321 is a diagram showing a configuration of a fourth modification 300D of the speech decoding device according to the twenty-first embodiment.

FIG. 322 is a flowchart showing the operation of the fourth modification 300D of the speech decoding device according to the twenty-first embodiment.

FIG. 323 is a diagram showing the configuration of a first modification 310A of the speech decoding device according to the twenty-second embodiment.

FIG. 324 is a flowchart showing the operation of the first modification 310A of the speech decoding device according to the twenty-second embodiment.

FIG. 325 is a diagram showing the configuration of a second modification 310B of the speech decoding device according to the twenty-second embodiment.

FIG. 326 is a flowchart showing the operation of the second modification 310B of the speech decoding device according to the twenty-second embodiment.

FIG. 327 is a diagram showing the configuration of a third modification 310C of the speech decoding device according to the twenty-second embodiment.

FIG. 328 is a flowchart showing the operation of a third modification 310C of the speech decoding device according to the twenty-second embodiment.

Fig. 329 is a diagram showing the configuration of a fourth modification 310D of the speech decoding device according to the twenty-second embodiment.

[Fig. 330] A flowchart showing the operation of the fourth modification 310D of the speech decoding device according to the twenty-second embodiment.

Fig. 331 is a diagram showing the configuration of a second modification 320B of the speech decoding device according to the twenty-third embodiment.

[Fig. 332] The second variation of the speech decoding device according to the twenty-third embodiment Flowchart of the action of the form 320B.

Fig. 333 is a diagram showing the configuration of a third modification 320C of the speech decoding device according to the twenty-third embodiment.

Fig. 334 is a flowchart showing the operation of the third modification 320C of the speech decoding device according to the twenty-third embodiment.

Fig. 335 is a diagram showing the configuration of a fourth modification 320D of the speech decoding device according to the twenty-third embodiment.

Fig. 336 is a flowchart showing the operation of the fourth modification 320D of the speech decoding device according to the twenty-third embodiment.

Fig. 337 is a diagram showing the configuration of a fifth modification 320E of the speech decoding device according to the twenty-third embodiment.

FIG. 338 is a flowchart showing the operation of a fifth modification 320E of the speech decoding device according to the twenty-third embodiment.

Fig. 339 is a diagram showing the configuration of a sixth modification 320F of the speech decoding device according to the twenty-third embodiment.

Fig. 340 is a flowchart showing the operation of the sixth modification 320F of the speech decoding device according to the twenty-third embodiment.

Fig. 341 is a diagram showing the configuration of a seventh modification 320G of the speech decoding device according to the twenty-third embodiment.

FIG. 342 is a flowchart showing the operation of the seventh modification 320G of the speech decoding device according to the twenty-third embodiment.

Fig. 343 is a diagram showing the configuration of an eighth modification 320H of the speech decoding device according to the twenty-third embodiment.

[Fig. 344] The eighth variation of the voice decoding device according to the twenty-third embodiment Flowchart of the action of the form 320H.

Fig. 345 is a diagram showing the configuration of a ninth modification 3201 of the speech decoding device according to the twenty-third embodiment.

FIG. 346 is a flowchart showing the operation of the ninth modification 3201 of the speech decoding device according to the twenty-third embodiment.

Fig. 347 is a diagram showing the configuration of a first modification 330A of the speech decoding device according to the twenty-fourth embodiment.

FIG. 348 is a flowchart showing the operation of the first modification 330A of the speech decoding device according to the twenty-fourth embodiment.

Fig. 349 is a diagram showing the configuration of a second modification 330B of the speech decoding device according to the twenty-fourth embodiment.

[Fig. 350] A flowchart showing the operation of the second modification 330B of the speech decoding device according to the twenty-fourth embodiment.

351 is a diagram showing the configuration of a third modification 330C of the speech decoding device according to the twenty-fourth embodiment.

FIG. 352 is a flowchart showing the operation of a third modification 330C of the speech decoding device according to the twenty-fourth embodiment.

FIG. 353 is a diagram showing a configuration of a fourth modification 330D of the speech decoding device according to the twenty-fourth embodiment.

FIG. 354 is a flowchart showing the operation of the fourth modification 330D of the speech decoding device according to the twenty-fourth embodiment.

FIG. 355 is a diagram showing the configuration of a first modification 340A of the speech decoding device according to the twenty-fifth embodiment.

[ Fig. 356] The first variation of the speech decoding device according to the twenty-fifth embodiment Flowchart of the action of the form 340A.

FIG. 357 is a diagram showing the configuration of a second modification 340B of the speech decoding device according to the twenty-fifth embodiment.

FIG. 358 is a flowchart showing the operation of the second modification 340B of the speech decoding device according to the twenty-fifth embodiment.

FIG. 359 is a diagram showing the configuration of a third modification 340C of the speech decoding device according to the twenty-fifth embodiment.

[Fig. 360] A flowchart showing the operation of a third modification 340C of the speech decoding device according to the twenty-fifth embodiment.

FIG. 361 is a diagram showing a configuration of a fourth modification 340D of the speech decoding device according to the twenty-fifth embodiment.

FIG. 362 is a flowchart showing the operation of the fourth modification 340D of the speech decoding device according to the twenty-fifth embodiment.

FIG. 363 is a diagram showing the configuration of a second modification 350B of the speech decoding device according to the twenty-sixth embodiment.

364 is a flowchart showing the operation of the second modification 350B of the speech decoding device according to the twenty-sixth embodiment.

FIG. 365 is a diagram showing the configuration of a third modification 350C of the speech decoding device according to the twenty-sixth embodiment.

FIG. 366 is a flowchart showing the operation of a third modification 350C of the speech decoding device according to the twenty-sixth embodiment.

FIG. 367 is a diagram showing the configuration of a fourth modification 350D of the speech decoding device according to the twenty-sixth embodiment.

[Fig. 368] The fourth variation of the speech decoding device according to the twenty-sixth embodiment Flowchart of the action of the form 350D.

FIG. 369 is a diagram showing the configuration of a fifth modification 350E of the speech decoding device according to the twenty-sixth embodiment.

FIG. 370 is a flowchart showing the operation of a fifth modification 350E of the speech decoding device according to the twenty-sixth embodiment.

FIG. 371 is a diagram showing a configuration of a sixth modification 350F of the speech decoding device according to the twenty-sixth embodiment.

FIG. 372 is a flowchart showing the operation of the sixth modification 350F of the speech decoding device according to the twenty-sixth embodiment.

FIG. 373 is a diagram showing a configuration of a seventh modification 350G of the speech decoding device according to the twenty-sixth embodiment.

FIG. 374 is a flowchart showing the operation of a seventh modification 350G of the speech decoding device according to the twenty-sixth embodiment.

FIG. 375 is a diagram showing the configuration of an eighth modification 350H of the speech decoding device according to the twenty-sixth embodiment.

Fig. 376 is a flowchart showing the operation of an eighth modification 350H of the speech decoding device according to the twenty-sixth embodiment.

Fig. 377 is a diagram showing the configuration of a ninth modification 350I of the speech decoding device according to the twenty-sixth embodiment.

Fig. 378 is a flowchart showing the operation of a ninth modification 350I of the speech decoding device according to the twenty-sixth embodiment.

FIG. 379 is a diagram showing the configuration of the sound decoding device 360 according to the twenty-seventh embodiment.

[Fig. 380] The movement of the sound decoding device 360 according to the twenty-seventh embodiment The flow chart.

FIG. 381 is a diagram showing the configuration of a first modification 360A of the speech decoding device according to the twenty-seventh embodiment.

FIG. 382 is a flowchart showing the operation of the first modification 360A of the speech decoding device according to the twenty-seventh embodiment.

FIG. 383 is a diagram showing the configuration of the sound decoding device 370 according to the twenty-eighth embodiment.

Fig. 384 is a flowchart showing the operation of the sound decoding device 370 according to the twenty-eighth embodiment.

FIG. 385 is a diagram showing the configuration of a first modification 370A of the speech decoding device according to the twenty-eighth embodiment.

FIG. 386 is a flowchart showing the operation of the first modification 370A of the speech decoding device according to the twenty-eighth embodiment.

FIG. 387 is a diagram showing the configuration of the sound decoding device 380 according to the twenty-ninth embodiment.

Fig. 388 is a flowchart showing the operation of the sound decoding device 380 according to the twenty-ninth embodiment.

FIG. 389 is a diagram showing the configuration of a first modification 380A of the speech decoding device according to the twenty-ninth embodiment.

390 is a flowchart showing the operation of the first modification 380A of the speech decoding device according to the twenty-ninth embodiment.

Fig. 391 is a diagram showing the configuration of the speech decoding device 390 according to the thirtieth embodiment.

[Fig. 392] The movement of the sound decoding device 390 according to the 30th embodiment The flow chart.

Various embodiments will be described with reference to the accompanying drawings. Where possible, the same parts are denoted by the same reference numerals and the repeated description is omitted.

[First Embodiment]

Fig. 1 is a view showing the configuration of a sound decoding device 10 according to the first embodiment. The communication device of the audio decoding device 10 receives the multiplexed code sequence output from the lower voice encoding device 20, and outputs the decoded audio signal to the outside. As shown in FIG. 1, the audio decoding device 10 is functionally provided with a code sequence inverse multiplexing unit 10a, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analysis unit 10d, and a low-frequency time envelope shape determination. The unit 10e, the low-frequency time envelope correction unit 10f, the high-frequency signal generation unit 10g, the decoding/inverse quantization unit 10h, the frequency envelope adjustment unit 10i, and the synthesis filter group unit 10j. The function and operation of each part will be described below.

Fig. 2 is a flowchart showing the operation of the sound decoding device 10 according to the first embodiment.

The code sequence inverse multiplexing unit 10a divides the code sequence into a core code portion encoded by a low frequency signal, a band extension portion required to generate a high frequency signal from a low frequency signal, and a low frequency time envelope shape determining portion. Information necessary on 10e (about low frequency time envelope shape Information) (step S10-1).

The code sequence analysis unit 10d analyzes the band extension portion of the code sequence divided by the coded sequence inverse multiplexing unit 10a, and divides it into the high frequency signal generation unit 10g and the decoding/inverse quantization unit 10h. Information (step S10-2).

The core decoding unit 10b receives and decodes the core coded portion of the code sequence from the code sequence inverse multiplexing unit 10a to generate a low frequency signal (step S10-3).

The analysis filter bank unit 10c divides the pre-recorded low-frequency signal into a plurality of sub-band signals (step S10-4).

The low-frequency time envelope shape determining unit 10e receives information on the shape of the low-frequency time envelope from the code sequence analyzing unit 10d, and determines the time envelope shape of the low-frequency signal based on the information (step S10-5). For example, a case in which the time envelope shape of the low-frequency signal is determined to be flat, a case in which the time envelope shape of the low-frequency signal is determined to be raised, and a case in which the time envelope shape of the low-frequency signal is determined to fall are cited.

The low-frequency time envelope correcting unit 10f corrects the shape of the time envelope of the complex sub-band signal of the low-frequency signal output from the analysis filter group unit 10c based on the time envelope shape determined by the low-frequency time envelope shape determining unit 10e ( Step S10-6).

For example, the low-frequency time envelope correction unit 10f is a complex sub-band signal X _dec,LO (k,i) of the pre-recorded low-frequency signal in an arbitrary time zone (0≦k<k _x , t _E (l)≦i< t _E (l+1)), using the specified function F(X _dec,LO (k,i)) by the following formula (1) The obtained X' _{dec, LO} (k, i) is output as a sub-band signal of the low-frequency signal whose time envelope shape has been corrected.

For example, when the time envelope shape of the low-frequency signal is determined to be flat, the time envelope shape of the low-frequency signal can be corrected by the following processing.

For example, the subband signal X _{dec, LO} (k, i) is divided into B _{dec, LO} (m) (m = 0, ..., M _LO , M _LO ≧ 1) (B _{dec, LO} (0) ≧ 0, B _{dec, LO} (M _LO ) < k _x ) represents the M _LO frequency bands of the boundary, for the sub-band signal X _{dec, LO} (k, i) (B _LO (m) ≦ k) contained in the m-th frequency band <B _LO (m+1), t _E (l) ≦i < t _E (l+1)), set the determined function F(X _{dec, LO} (k, i)) to X' _{dec, LO} (k, i) is output as a sub-band signal of the low-frequency signal whose time envelope shape has been corrected.

Further, according to another example, the predetermined function F(X _{dec, LO} (k, i)) is subjected to smoothing filter processing for the sub-band signals X _{dec, LO} (k, i). Definition (N _filt ≧ 1), and X' _{dec, LO} (k, i) is output as a sub-band signal of the low-frequency signal whose time envelope shape has been corrected. Then, in each frequency band in which the boundary B _{dec, LO} (m) is used, the power of the sub-band signals before and after the filter processing can be made uniform.

According to another example, the sub-band signal X _{dec, LO} (k, i) is linearly predicted in the frequency direction in each frequency band of the boundary by using B _{dec, LO} (m) before use to obtain a linear prediction coefficient α. _p (m) (m = 0, ..., M _LO -1), linearly predicting the sub-band signal X _{dec, LO} (k, i) by the defined function F(X _{dec, LO} (k, i)) Inverse filter processing.

The definition is (N _pred ≧1), and X' _{dec, LO} (k, i) is output as a sub-band signal of the low-frequency signal whose time envelope shape has been corrected.

An example in which the above-described time envelope shape is corrected to be flat can be implemented by combining the respective ones. The low-frequency time envelope correcting unit 10f performs a process of correcting the shape of the time envelope of the complex sub-band signal of the low-frequency signal to be flat, and is not limited to the above example.

Even, for example, when the time envelope shape of the low-frequency signal is determined to be raised, the time envelope shape of the low-frequency signal can be corrected by the following processing.

For example, the defined function F(X _dec,LO (k,i)) is defined as a monotonically increasing function incr(i) for i. X' _{dec, LO} (k, i) is output as a sub-band signal of the low-frequency signal whose time envelope shape has been corrected. Then, in each frequency band in which the boundary B _{dec and LO} (m) are used, the power of the sub-band signals before and after the correction of the time envelope shape can be made uniform.

The low-frequency time envelope correcting unit 10f performs a process of correcting the shape of the time envelope of the complex sub-band signal of the low-frequency signal to be raised, and is not limited to the above example.

Even, for example, when the time envelope shape of the low-frequency signal is determined to be down, the time envelope shape of the low-frequency signal can be corrected by the following processing.

For example, the defined function F(X _{dec, LO} (k, i)) is defined as a monotonically decreasing function decr(i) for i. X' _{dec, LO} (k, i) is output as a sub-band signal of the low-frequency signal whose time envelope shape has been corrected. Then, in each frequency band in which the boundary B _{dec and LO} (m) are used, the power of the sub-band signals before and after the correction of the time envelope shape can be made uniform.

The low-frequency time envelope correcting unit 10f performs a process of correcting the shape of the time envelope of the complex sub-band signal of the low-frequency signal to fall. It is not limited to the above example.

The decoding/inverse quantization unit 10h determines the design of the scale factor band and the length of the time segment in the generation/adjustment processing of the high-frequency signal by the information of the time/frequency resolution force output from the code sequence analysis unit 10d. Then, the information on the gain of the high-frequency signal generated by the high-frequency signal generating unit 10g and the information on the noise signal added to the high-frequency signal are collected by the code sequence analyzing unit 10d, decoded, and inverse quantized to obtain a high value. The gain of the frequency signal and the size of the noise signal (step S10-7). In addition, regarding the design of the scale factor band and the length of the time zone, it is not necessary to determine if it has been decided beforehand.

The high-frequency signal generating unit 10g is based on the sub-band signal of the input low-frequency signal, based on the information output from the code sequence analyzing unit 10d, the design of the scale factor band output from the decoding/inverse quantization unit 10h, and the time section. At least one of the lengths generates a high frequency signal (step S10-8). In the present embodiment, the sub-band signal of the low-frequency signal divided by the analyzed filter bank unit 10c is input.

The frequency envelope adjustment unit 10i adjusts the gain of the high-frequency signal generated by the high-frequency signal generating unit 10g and the addition of the noise signal based on the gain and the noise signal obtained by the decoding/inverse quantization unit 10h. The frequency envelope of the high frequency signal (step S10-9). Then, a sinusoidal signal may be added, and the additional sine wave signal may also be based on the information contained in the band extension of the coding sequence.

The synthesis filter bank unit 10j is a sub-band signal and a slave frequency envelope of the low-frequency signal output from the low-frequency time envelope correction unit 10f. The time signal from the sub-band signal of the high-frequency signal outputted by the adjustment unit 10i is combined and output as an output audio signal (step S10-10).

The processing of steps S10-1 to S10-4 and S10-7 to S10-10 can be performed by the respective processes of "SBR" and "Low Delay SBR" specified in "ISO/IEC 14496-3".

Fig. 3 is a view showing the configuration of the speech encoding device 20 according to the first embodiment. The communication device of the audio encoding device 20 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 3, the voice encoding device 20 is functionally provided with a down-sampling unit 20a, a core encoding unit 20b, analysis filter group units 20c and 20c1, a control parameter encoding unit 20d, and an envelope calculation unit 20e. The quantization/encoding unit 20f, the time envelope information encoding unit 20g, the code sequence multiplexing unit 20h, the sub-band signal power calculating unit 20j, and the core decoding signal generating unit 20i. The function and operation of each part will be described below.

Fig. 4 is a flowchart showing the operation of the speech encoding device 20 according to the first embodiment.

The down-conversion sampling unit 20a performs down-sampling of the input audio signal to obtain a down-sampled input audio signal corresponding to the low-frequency signal of the input audio signal (step S20-1).

The core coding unit 20b encodes the downsampled signal obtained by the downsampling unit 20a to generate a code sequence of the low frequency signal (step S20-2).

The analysis filter group unit 20c divides the input sound signal into a plurality of sub-band signals (step S20-3).

The control parameter encoding unit 20d encodes the control parameters necessary for generating the high-frequency signal in the sound decoding device 10 (step S20-4). The parameters are information such as time/frequency resolution. For example, it includes information used to determine the design of the scale factor band and the length of the time segment on the decoding/inverse quantization unit 10h of the sound decoding device 10.

The envelope calculation unit 20e calculates the gain and the noise signal of the high frequency signal decoded/requantized by the decoding/inverse quantization unit 10h of the audio decoding device 10 from the subband signal obtained by the analysis filter unit 20c. Size (step S20-5).

The quantization/encoding unit 20f quantizes and encodes the gain of the high-frequency signal and the size of the noise signal calculated by the envelope calculation unit 20e (step S20-6).

The core decoding signal generating unit 20i generates the core decoding signal using the information encoded by the core encoding unit 20b (step S20-7). This processing can be carried out in the same manner as the core decoding unit 10b of the audio decoding device 10. Further, the core decoded signal can be generated by using the quantized information before encoding in the core encoding unit 20b. Further, some of the information may be different from the core decoding unit 10b of the audio decoding device 10. For example, when CELP coding is used, the signal held in the adaptation codebook in the decoding device is excited by the past decoding. Signal or the signal processed by it, but it can also be used in the core decoding In the number generating unit 20i, a residual signal obtained by linearly predicting the input audio signal is input.

The analysis filter group unit 20c1 divides the core decoded signal generated by the core decoded signal generating unit 20i into a plurality of sub-band signals (step S20-8). In the processing, the resolution from the core decoded signal to the sub-band signal may be the same as that of the analysis filter unit 20c.

The sub-band signal power calculation unit 20j calculates the power of the sub-band signal of the core decoded signal obtained by the analyzed filter bank unit 20c1 (step S20-9). This processing is performed in the same manner as the calculation of the power of the sub-band signal of the low-frequency signal in the envelope calculation unit 20e.

The time envelope information encoding unit 20g calculates the time envelope of the low frequency signal using the power of the subband signal of the low frequency signal calculated by the envelope calculation unit 20e, and similarly calculates the time of the core decoding signal using the power of the subband signal of the core decoded signal. The envelope calculates the time envelope information and encodes the time envelope of the low frequency signal and the core decoded signal (step S20-10). In the processing, if the power of the sub-band signal of the low-frequency signal is not calculated, the power of the sub-band signal of the low-frequency signal can be calculated by the time envelope information encoding unit 20g, and the power of the sub-band signal of the low-frequency signal is calculated. There is no limit.

For example, in any period of time t _E (l) ≦ i < t _E (l+1), divide into B _LO (m) (m = 0, ..., M _LO , M _LO ≧ 1) (B _LO (0) ≧0, B _LO (M _LO )<k _x ) represents the M _LO frequency band of the boundary, and the sub-band signal of the low-frequency signal contained in the m-th frequency band X _LO (k, i) (B _LO (m)时间k<B _LO (m+1), t _E (l)≦i<t _E (l+1)) The time envelope E _LO (k,i) can be made in the pre-recorded time zone and frequency band. The normalization is calculated as the power of the sub-band signal X _LO (k, i) of the low-frequency signal.

Similarly, the time envelope E _{dec, LO} (k, i) of the core decoded signal, the sub-band signal of the core decoding signal X _{dec, LO} (k, i) can be normalized in the previous time zone and the frequency band. Calculated by the way of power.

The time envelope of the sub-band signal of the low-frequency signal and the core decoded signal is not limited to the pre-recorded example as long as it is a parameter that changes the time direction of the sub-band signal of the low-frequency signal and the core decoded signal.

For example, the time envelope information encoding unit 20g calculates information indicating the degree of flatness of the time envelope information. For example, the dispersion of the time envelope of the sub-band signal of the low-frequency signal and the core decoded signal or a parameter similar thereto is calculated. In another example, the ratio of the sum of the time envelopes of the sub-band signals of the low-frequency signal and the core decoded signal to the multiplied average or a parameter similar thereto is calculated. In this case, the time envelope information encoding unit 20g is only required to calculate the flatness of the time envelope indicating the sub-band signal of the low-frequency signal as the time envelope information, and is not limited to the example described above. Then, encode the pre-recorded parameters. For example, the difference value of the low frequency signal and the parameter of the core decoded signal or its absolute value is encoded. Then, for example, the value or absolute value of the parameter of the low frequency signal is encoded. For example, to whether the time is expressed planar flatness of the envelope, the one yuan can be used to encode, for example, the front section may be referred to an arbitrary time when the information bits to M _LO former referred to the number of each band M _LO The yuan is encoded. The encoding method of the time envelope information is not limited to the pre-recording example.

For example, the time envelope information encoding unit 20g calculates information indicating the degree of elevation of the time envelope information. For example, in any of the time segments t _E (l) ≦ i < t _E (l+1), the maximum value of the difference value in the time direction of the time envelope of the sub-band signal of the low-frequency signal is calculated.

[ _Equation 9] d _{ELO ,max} ( k )=max( E _LO ( k , i )- E _LO ( k , i -1)) d _{Edec , LO ,max} ( k )=max( E _{dec , LO} ( k , i )- E _{dec , LO} ( k , i -1)) These are called formula (9). Even in the equation (9), instead of the time envelope, the maximum value of the difference value in the time direction in which the time envelope is smoothed in the time direction can be calculated.

In this case, the time envelope information encoding unit 20g is only required to calculate the temporal envelope information indicating the degree of the sub-band signal of the low-frequency signal as the time envelope information, and is not limited to the example described above. Then, encode the pre-recorded parameters. For example, the difference value of the low frequency signal and the parameter of the core decoded signal or its absolute value is encoded. For example, if the time envelope is to be raised by whether it is up, it can be encoded by 1 bit. For example, in the pre-recorded arbitrary time zone, the information can be M _LO bit for each of the pre-recorded M _LO bands. The yuan is encoded. The encoding method of the time envelope information is not limited to the pre-recording example.

Even, for example, the time envelope information encoding unit 20g calculates information indicating the degree of decline in the time envelope information. For example, in any of the time segments t _E (l) ≦ i < t _E (l+1), the minimum value of the difference value in the time direction of the time envelope of the sub-band signal of the low-frequency signal is calculated.

[ _Equation 10] d _{ELO ,min} ( k )=min( E _LO ( k , i )- E _LO ( k , i -1)) d _{Edec , LO ,min} ( k )=min( E _{dec , LO} ( k , i )- E _{dec , LO} ( k , i -1)) These are called formula (10). Even in the equation (10), instead of the time envelope, the minimum value of the difference value in the time direction of the parameter obtained by smoothing the time envelope in the time direction can be calculated.

In this case, the time envelope information encoding unit 20g is only required to calculate the time envelope information indicating the sub-band signal of the low-frequency signal as the time envelope information, and is not limited to the example of the foregoing. Then, encode the pre-recorded parameters. For example, the difference value of the low frequency signal and the parameter of the core decoded signal or its absolute value is encoded. For example, if the time envelope is to be frustrated by whether it is down, it can be encoded by 1 bit. For example, in the pre-recorded arbitrary time zone, the information can be M _LO bit for each of the pre-recorded M _LO bands. The yuan is encoded. The encoding method of the time envelope information is not limited to the pre-recording example.

In the case of calculating the information indicating the degree of flatness, the degree of rise, and the degree of decline as an example of the pre-recorded time envelope information, only one of the time envelopes of the low-frequency signal and the core decoded signal is used. It is possible to save the parts and processes that are only slightly related to the calculation of the other time envelope.

The coding sequence multiplexing unit 20h multiplexes one or more encoded sequences or the encoded information or the encoded parameters, and outputs them as a code sequence (step S20-11). Here, the core coding unit 20b receives the code sequence of the low frequency signal, receives the coded control parameter from the control parameter coding unit 20d, and receives the gain and the noise signal from the quantization/encoding unit 20f for the encoded high frequency signal. The size is received from the time envelope information encoding unit 20g, and the time envelope information has been encoded, and these are multiplexed into a code sequence and output.

The processing of steps S20-1 to S20-6 and S20-80 can be performed by the respective processes of the encoders of "SBR" and "Low Delay SBR" defined by "ISO/IEC 14496-3".

[First Modification of Sound Decoding Device According to First Embodiment]

Fig. 5 is a view showing a configuration of a first modification 10A of the voice decoding device according to the first embodiment. In addition, in the following, the characteristic functions and operations of the modified examples and the embodiments will be described, and the overlapping description will be omitted within the possible range.

The code sequence inverse multiplexing unit 10aA divides the code sequence into a core code portion encoded by a low frequency signal and a band extension portion required to generate a high frequency signal from the low frequency signal (step S10-1a).

Fig. 6 is a flowchart showing the operation of the first modification 10A of the speech decoding device according to the first embodiment.

The low-frequency time envelope shape determining unit 10eA is a solution from the core The code portion 10b receives the low frequency signal and determines the time envelope shape of the low frequency signal (step S10-5a).

For example, the time envelope shape of the low frequency signal is determined to be flat. For example, the power of the low frequency signal x _dec (t) or a parameter similar thereto is calculated, and the dispersion of the parameter or a parameter similar thereto is calculated. The calculated parameters are compared to a predetermined threshold to determine if the shape of the time envelope is flat or flat. In another example, the ratio of the sum average and the multiplied average of the power of the low frequency signal x _dec (t) or a parameter similar _thereto or a parameter similar _thereto is calculated and compared with the predetermined threshold to determine the shape of the time envelope. Whether it is flat or flat. The method of determining the temporal envelope shape of the low-frequency signal to be flat is not limited to the above example.

Even for example, the time envelope shape of the low frequency signal is determined to rise. For example, the power of the low-frequency signal x _dec (t) or a parameter similar thereto is calculated, the difference value of the time direction of the parameter is calculated, and the maximum value of the difference value in an arbitrary time zone is calculated. The maximum value is compared with the predetermined threshold to determine whether the shape of the time envelope is raised or raised. The method of determining the temporal envelope shape of the low-frequency signal to be raised is not limited to the above example.

Even for example, the time envelope shape of the low frequency signal is determined to be down. For example, the power of the low-frequency signal x _dec (t) or a parameter similar thereto is calculated, the difference value of the time direction of the parameter is calculated, and the minimum value of the difference value in an arbitrary time zone is calculated. The minimum value is compared to the predetermined threshold to determine whether the shape of the time envelope is down or down. The method of determining the time envelope shape of the low-frequency signal as a fall is not limited to the above example.

[Second Modification of Sound Decoding Device According to First Embodiment]

Fig. 7 is a view showing the configuration of a second modification 10B of the speech decoding device according to the first embodiment.

The difference from the first modification of the audio decoding device according to the first embodiment is the low-frequency time envelope shape determining unit 10eB, which is a complex sub-band signal for receiving a low-frequency signal from the analysis filter bank unit 10c, and determines a low-frequency signal. The time envelope shape is this (corresponding to the processing of step S10-5a).

For example, the time envelope shape of the low frequency signal is determined to be flat. For example, in any period of time t _E (l) ≦ i < t _E (l+1), divide into B _LO (m) (m = 0, ..., M _LO , M _LO ≧ 1) (B _LO (0) ≧0, B _LO (M _LO )<k _x ) represents the M _LO frequency bands of the boundary, and the sub-band signals X _{dec, LO} (k, i) of the low-frequency signals contained in the m-th frequency band are obtained. _LO (m) ≦ k < B _LO (m +1), t _E (l) ≦ i < t _E (l +1)) time envelope E _{dec, LO} (k, i) or a parameter similar thereto, and The predetermined threshold is compared to determine whether the shape of the time envelope is flat or flat. The time envelope E _{dec, LO} (k, i) can be calculated by, for example, the equation (8), but is not limited thereto. In another example, the subband signal X _{dec, LO} (k, i) (B _LO (m) ≦ k < B _LO (m +1), t _E (l) ≦ i < t _{E of the} low frequency signal is calculated. (l+1)) The time envelope E _{dec, LO} (k, i) or a ratio of the sum of the averages of the parameters and the multiplied average or a parameter similar thereto, compared with the predetermined threshold to determine the shape of the time envelope Whether it is flat or flat. The time envelope E _{dec, LO} (k, i) can be calculated by, for example, the equation (8), but is not limited thereto. The method of determining the temporal envelope shape of the low-frequency signal to be flat is not limited to the above example.

Even for example, the time envelope shape of the low frequency signal is determined to rise. For example, in any period of time t _E (l) ≦ i < t _E (l+1), the sub-band signal X _{dec, LO} (k, i) of the low-frequency signal is calculated (B _LO (m) ≦ k < B _LO (m+1), t _E (l) ≦i < t _E (l+1)) The maximum value of the difference value of the time envelope E _dec,LO (k, i). For example, it can be calculated by the formula (9). The maximum value of the difference value is compared with the predetermined threshold to determine whether the shape of the time envelope is raised or raised. It is even possible to replace the time envelope with a parameter that smoothes the time envelope to the time direction. The method of determining the temporal envelope shape of the low-frequency signal to be raised is not limited to the above example.

Even for example, the time envelope shape of the low frequency signal is determined to be down. Calculate the time of the sub-band signal X _dec,LO (k,i) of the low-frequency signal (B _LO (m)≦k<B _LO (m+1), t _E (l)≦i<t _E (l+1)) The minimum value of the difference between the envelope E _{dec, LO} (k, i). For example, it can be calculated by the formula (10). The minimum value of the difference value is compared with the predetermined threshold to determine whether the shape of the time envelope is down or down. It is even possible to replace the time envelope with a parameter that smoothes the time envelope to the time direction. The method of determining the time envelope shape of the low-frequency signal as a fall is not limited to the above example.

[Third Modification of Sound Decoding Device According to First Embodiment]

FIG. 8 is a view showing a configuration of a third modification 10C of the voice decoding device according to the first embodiment.

The low-frequency time envelope shape determining unit 10eC sets the information on the low-frequency time envelope shape from the code sequence analyzing unit 10d, the low-frequency signal from the core decoding unit 10b, and the complex sub-band signal from the low-frequency signal of the analysis filter group unit 10c. At least one of them is charged to determine the time envelope shape of the low frequency signal (corresponding to step S10-5 of FIG. 2).

For example, the time envelope shape of the low frequency signal is determined to be flat. In this case, at least one or more of the methods for determining the temporal envelope shape of the low-frequency signal described in the audio decoding device according to the first embodiment and the first and second modifications of the decoding device are combined. The time envelope shape is determined to be flat. The method of determining the temporal envelope shape of the low-frequency signal to be flat is not limited to the above.

For example, the time envelope shape of the low frequency signal is determined to rise. In this case, at least one or more of the methods for determining the temporal envelope shape of the low-frequency signal described in the first and second modifications of the decoding device according to the first embodiment of the present invention are combined. The shape of the time envelope is determined to rise. The method of determining the time envelope shape of the low-frequency signal to be raised is not limited to the above.

For example, the time envelope shape of the low frequency signal is determined to be down. In this case, at least one or more of the methods for determining the temporal envelope shape of the low-frequency signal described in the first and second modifications of the decoding device according to the first embodiment of the present invention are combined. The shape of the time envelope is determined to fall. The method of determining the time envelope shape of the low-frequency signal as a fall is not limited to the above.

[First Modification of the Voice Encoding Device of the First Embodiment]

FIG. 9 is a view showing a configuration of a first modification 20A of the speech encoding device according to the first embodiment.

FIG. 10 is a flowchart showing the operation of the first modification 20A of the speech encoding device according to the first embodiment.

The time envelope information encoding unit 20gA calculates the time envelope of the low frequency signal using the power of the subband signal of the low frequency signal calculated by the envelope calculation unit 20e, and encodes the time envelope information by the time envelope (step S20-10a). In the processing, if the power of the sub-band signal of the low-frequency signal is not calculated, the power of the sub-band signal of the low-frequency signal can be calculated in the time envelope information encoding unit 20gA, and the power of the sub-band signal of the low-frequency signal is calculated. There is no limit.

For example, as time envelope information, information indicating the flatness of the shape of the time envelope is calculated. For example, in any period of time t _E (l) ≦ i < t _E (l+1), divide into B _LO (m) (m = 0, ..., M _LO , M _LO ≧ 1) (B _LO (0) ≧0, B _LO (M _LO )<k _x ) represents the M _LO frequency band of the boundary, and the sub-band signal X _LO (k, i) of the low-frequency signal contained in the m-th frequency band (B _LO (m The time envelope E _LO (k, i) of ≦k < B _LO (m+1), t _E (l) ≦ i < t _E (l+1)), is calculated by the equation (7). Further, the method of calculating the time envelope E _LO (k, i) is not limited to the formula (7). The dispersion of the time envelope E _LO (k, i) or a parameter similar thereto is calculated, and the parameter is encoded. In still other examples, the ratio of the sum average of the time envelope E _LO (k, i) to the multiplied average or a parameter similar thereto is calculated, and the parameter is encoded. The method of calculating the information indicating the flatness of the temporal envelope shape of the low-frequency signal is not limited to the above example.

For example, information indicating the degree of elevation of the temporal envelope shape is calculated as time envelope information. For example, the difference value in the time direction of the time envelope E _LO (k, i) is calculated, and the maximum value of the difference value in an arbitrary time zone is calculated and encoded. The method of calculating the information indicating the degree of rise of the time envelope shape of the low-frequency signal is not limited to the above example.

Even for example, information indicating the degree of decline in the shape of the time envelope is calculated as time envelope information. For example, the difference value in the time direction of the time envelope E _LO (k, i) is calculated, and the minimum value of the difference value in an arbitrary time zone is calculated and encoded. The method of calculating the information indicating the degree of decline in the temporal envelope shape of the low-frequency signal is not limited to the above example.

[Second Embodiment]

Fig. 11 is a view showing the configuration of the sound decoding device 11 according to the second embodiment. The communication device of the audio decoding device 11 receives the multiplexed code sequence output from the lower voice encoding device 21, and outputs the decoded audio signal to the outside. As shown in FIG. 11, the audio decoding device 11 is functionally provided with a code sequence inverse multiplexing unit 10a, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analysis unit 10d, and a low-frequency time envelope shape determination. The unit 10e, the low-frequency time envelope correction unit 10f, the high-frequency signal generation unit 10g, the decoding/inverse quantization unit 10h, the frequency envelope adjustment unit 10i, and the synthesis filter group unit 10j.

Fig. 12 is a flowchart showing the operation of the sound decoding device 11 according to the second embodiment.

The operation of the high-frequency signal generating unit 10g and the first embodiment The difference point of the high-frequency signal generating unit 10g of the audio decoding device 11 described above is that the low-frequency time envelope correcting unit 10f generates a high-frequency signal from the sub-band signal of the low-frequency signal whose time envelope shape has been corrected.

Figure 13 is a diagram showing a voice encoding device 21 according to a second embodiment. An illustration of the composition. The communication device of the audio encoding device 21 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 13, the voice encoding device 21 is functionally provided with a down-sampling unit 20a, a core encoding unit 20b, analysis filter group units 20c and 20c1, a control parameter encoding unit 20d, and an envelope calculation unit 20e. The quantization/encoding unit 20f, the time envelope information encoding unit 21a, the code sequence multiplexing unit 20h, the sub-band signal power calculation unit 20j, and the core decoding signal generating unit 20i.

Fig. 14 is a flowchart showing the operation of the speech encoding device 21 according to the second embodiment.

The time envelope information encoding unit 21a calculates the time envelope of the low-frequency signal and the time envelope of the high-frequency signal by using the power of the sub-band signal of the low-frequency signal calculated by the envelope calculation unit 20e and the power of the sub-band signal of the high-frequency signal. The time envelope of the core decoded signal is calculated using the power of the subband signal of the core decoded signal calculated by the subband signal power calculation unit 20j, according to the time envelope of the low frequency signal, the time envelope of the high frequency signal, and the core decoding signal. The time envelope to encode the time envelope information (step S21-1). In the processing, if the power of the sub-band signal of the low-frequency signal is not calculated, it may also be in the time packet. The network information encoding unit 21a calculates the power of the sub-band signal of the low-frequency signal, and the power of the sub-band signal of the low-frequency signal is calculated, and is not limited. In the processing, if the power of the sub-band signal of the high-frequency signal is not calculated, the power of the sub-band signal of the high-frequency signal can be calculated in the time envelope information encoding unit 21a, and the power of the sub-band signal of the high-frequency signal is Calculated, there is no limit.

Specifically, for example, in any period of time t _E (l) ≦ i < t _E (l + 1), it is divided into B _LO (m) (m = 0, ..., M _LO , M _LO ≧ 1 (B _LO (0) ≧ 0, B _LO (M _LO ) < k _x ) represents the M _LO frequency bands of the boundary, and the sub-band signal X _LO (k, i) of the low-frequency signal contained in the m-th frequency band ( B _LO (m) ≦ k < B _LO (m +1), t _E (l) ≦ i < t _E (l +1)) time envelope E _LO (k, i), and sub-band signal of the core decoded signal X _dec,LO (k,i)(B _LO (m)≦k<B _LO (m+1), t _E (l)≦i<t _E (l+1)) time envelope E _dec,LO ( k, i) are calculated using equations (7) and (8), respectively. Similarly, in any period of time t _E (l) ≦ i < t _E (l + 1), it is divided into B _HI (m) (m = 0, ..., M _HI , M _HI ≧ 1) (B _HI (0) ≧ k _x , B _HI (M _HI ) < k _h ) represents the M _HI frequency bands of the boundary, and the sub-band of the high-frequency signal contained in the m-th frequency band X _HI (k, i) (B The time envelope E _HI (k, i) of _HI (m) ≦ k < B _HI (m+1), t _E (l) ≦ i < t _E (l+1)) is calculated.

The time envelope of the sub-band signal of the high-frequency signal is not limited to the pre-recorded example as long as it is a parameter that changes the time direction of the size of the sub-band signal of the high-frequency signal.

For example, the time envelope information encoding unit 21a calculates information indicating the degree of flatness of the time envelope information. For example, the dispersion of the time envelope of the sub-band signal of the low-frequency signal, the core decoded signal, and the high-frequency signal or the parameters thereof are calculated. In another example, the ratio of the summed average to the multiplied average of the time envelope of the low frequency signal, the core decoded signal, and the subband signal of the high frequency signal is calculated or a parameter similar thereto. In this case, the time envelope information encoding unit 21a may calculate the flatness of the time envelope indicating the sub-band signal of at least one of the low-frequency signal and the high-frequency signal as the time envelope information, and is not limited to the time envelope information. An example of the prescript. Then, encode the pre-recorded parameters. For example, the difference value of the low frequency signal and the parameter of the core decoded signal or its absolute value is encoded. Then, for example, the value or absolute value of the low frequency signal and the high frequency signal are encoded. For example, to whether the time is expressed planar flatness of the envelope, the one yuan can be used to encode, for example, the front section may be referred to an arbitrary time when the information bits to M _LO former referred to the number of each band M _LO The yuan is encoded. The encoding method of the time envelope information is not limited to the pre-recording example.

Even, for example, the time envelope information encoding unit 21a calculates information indicating the degree of rise of the time envelope information. For example, in any period of time t _E (l) ≦ i < t _E (l+1), the maximum value of the difference value in the time direction of the time envelope of the sub-band signal of the low-frequency signal is calculated using (9). . Similarly, for example, in any period of time t _E (l) ≦ i < t _E (l+1), the maximum value of the difference value in the time direction of the time envelope of the sub-band signal of the high-frequency signal is calculated.

[Equation 12] d _{EHI , max} ( k )=max( E _HI ( k , i )- E _HI ( k , i -1)) Equation (12), even in equation (12), can replace time envelope modification The maximum value of the difference value in the time direction of the parameter obtained by smoothing the time envelope in the time direction is calculated. In this case, the time envelope information encoding unit 21a may calculate the temporal envelope information indicating the degree of the sub-band signal of at least one of the low-frequency signal and the high-frequency signal as the time envelope information, and is not limited to the time envelope information. An example of the prescript. Then, encode the pre-recorded parameters. For example, the difference value of the low frequency signal and the parameter of the core decoded signal or its absolute value is encoded. Then, for example, the values of the low frequency signal and the high frequency signal are encoded. For example, if the time envelope is to be raised by whether it is up, it can be encoded by 1 bit. For example, in the pre-recorded arbitrary time zone, the information can be M _LO bit for each of the pre-recorded M _LO bands. The yuan is encoded. The encoding method of the time envelope information is not limited to the pre-recording example.

Even, for example, the time envelope information encoding unit 21a calculates information indicating the degree of decline in the time envelope information. For example, in any of the time segments t _E (l) ≦ i < t _E (l+1), the minimum value of the difference value in the time direction of the time envelope of the sub-band signal of the low-frequency signal is calculated using (10). . Similarly, for example, in any of the time segments t _E (l) ≦ i < t _E (l+1), the minimum value of the difference value in the time direction of the time envelope of the sub-band signal of the high-frequency signal is calculated.

[Equation 13] d _{EHI ,min} ( k )=min( E _HI ( k , i )- E _HI ( k , i -1)) Equation (13), even in equation (13), can replace time envelope modification The minimum value of the difference value in the time direction of the parameter obtained by smoothing the time envelope in the time direction is calculated. In this case, the time envelope information encoding unit 21a may calculate the time envelope of the sub-band signal indicating at least one of the low-frequency signal and the high-frequency signal as the time envelope information, and is not limited to the time envelope information. An example of the prescript. Then, encode the pre-recorded parameters. For example, the difference value of the low frequency signal and the parameter of the core decoded signal or its absolute value is encoded. Then, for example, the values of the low frequency signal and the high frequency signal are encoded. For example, if the time envelope is to be frustrated by whether it is down, it can be encoded by 1 bit. For example, in the pre-recorded arbitrary time zone, the information can be M _LO bit for each of the pre-recorded M _LO bands. The yuan is encoded. The encoding method of the time envelope information is not limited to the pre-recording example.

[First Modification of the Voice Encoding Device of the Second Embodiment]

Fig. 15 is a view showing the configuration of a first modification 21A of the speech encoding device according to the second embodiment.

Fig. 16 is a flowchart showing the operation of the first modification 21A of the speech encoding device according to the second embodiment.

The time envelope information encoding unit 21aA calculates the time envelope of the input audio signal using the power of the sub-band signal of the input audio signal calculated by the envelope calculation unit 20e, and uses the time envelope to time the packet. The network information is encoded (step S21-1a). In the processing, if the power of the sub-band signal input to the audio signal is not calculated, the power of the sub-band signal input to the audio signal can be calculated in the time envelope information encoding unit 21aA, and the power of the sub-band signal input to the audio signal is Calculated, there is no limit.

For example, as time envelope information, information indicating the flatness of the shape of the time envelope is calculated. For example, in any period of time t _E (l) ≦ i < t _E (l+1), divide into B _LO (m) (m = 0, ..., M _LO , M _LO ≧ 1) (B _LO (0) ≧0, B _LO (M _LO )<k _x ) represents the M _LO frequency band of the boundary, and the sub-band signal X _LO (k, i) of the low-frequency signal contained in the m-th frequency band (B _LO (m The time envelope E _LO (k, i) of ≦k < B _LO (m+1), t _E (l) ≦ i < t _E (l+1)), is calculated by the equation (7). Further, the method of calculating the time envelope E _LO (k, i) is not limited to the formula (7). Similarly, in any period of time t _E (l) ≦ i < t _E (l + 1), it is divided into B _HI (m) (m = 0, ..., M _HI , M _HI ≧ 1) (B _HI (0) ≧ k _x , B _HI (M _HI ) < k _h ) represents the M _HI frequency bands of the boundary, and the sub-band signal X _HI (k, i) of the low-frequency signal contained in the m-th frequency band (B _HI (m) Time envelope E _HI (k, i) of ≦k < B _HI (m+1), t _E (l) ≦ i < t _E (l+1)), which is calculated by the equation (11). Further, the method of calculating the time envelope E _HI (k, i) is not limited to the formula (11). Calculating the dispersion of the time envelope E _LO (k, i) or a parameter similar thereto, and the dispersion of the time envelope E _HI (k, i) or at least one of the parameters thereof, and calculating the parameter Coded individually or in combination. In another example, the ratio of the sum of the average envelope of the time envelope E _LO (k, i) to the multiplied average or a parameter similar thereto and the sum of the time envelopes E _HI (k, i) are multiplied and multiplied. At least one of the average ratio or a parameter similar thereto is calculated, and the parameters are encoded individually or in combination. The method of calculating the information indicating the flatness of the temporal envelope shape is not limited to the above example.

For example, information indicating the degree of elevation of the temporal envelope shape is calculated as time envelope information. For example, the difference value in the time direction of the time envelope E _LO (k, i) is calculated, and the maximum value of the difference value in an arbitrary time zone is calculated. Similarly, the difference value in the time direction of the time envelope E _HI (k, i) is calculated, and the maximum value of the difference value in an arbitrary time zone is calculated. The parameters are encoded individually or in combination. The method of calculating the information indicating the degree of rise of the time envelope shape of the low-frequency signal is not limited to the above example.

Even for example, information indicating the degree of decline in the shape of the time envelope is calculated as time envelope information. For example, the difference value in the time direction of the time envelope E _LO (k, i) is calculated, and the minimum value of the difference value in an arbitrary time zone is calculated. Similarly, the difference value in the time direction of the time envelope E _HI (k, i) is calculated, and the minimum value of the difference value in an arbitrary time zone is calculated. The parameters are encoded individually or in combination. The method of calculating the information indicating the degree of decline in the temporal envelope shape of the low-frequency signal is not limited to the above example.

The first, second, and third modifications of the first embodiment of the present invention are applicable to the low-frequency envelope shape determining unit 10e of the second embodiment, and it is needless to say that there is no doubt.

In the audio decoding device 11 of the second embodiment, the speech encoding device 20 according to the first embodiment of the present invention and its The code sequence encoded by the voice encoding device 20A of the first modification is decoded.

[Third embodiment]

Fig. 17 is a view showing the configuration of the sound decoding device 12 according to the third embodiment. The communication device of the audio decoding device 12 receives the multiplexed code sequence output from the lower voice encoding device 22, and outputs the decoded audio signal to the outside. As shown in FIG. 17, the audio decoding device 12 is functionally provided with an encoding sequence inverse multiplexing unit 10a, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analyzing unit 10d, and a low-frequency time envelope shape determination. The unit 10e, the low-frequency time envelope correction unit 12a, the high-frequency signal generation unit 10g, the decoding/inverse quantization unit 10h, the frequency envelope adjustment unit 10i, and the synthesis filter group unit 10j.

Fig. 18 is a flowchart showing the operation of the sound decoding device 12 according to the third embodiment.

The low-frequency time envelope correcting unit 12a corrects the shape of the time envelope of the low-frequency signal output from the core decoding unit 10b based on the time envelope shape determined by the low-frequency time envelope shape determining unit 10e (step S12-1).

For example, the low-frequency time envelope correction unit 12a determines the use of the pre-recorded low-frequency signals x _{dec, LO} (i) in the arbitrary time segment t _{t, E} (l) ≦ i < t _{t, E} (l+1)). The function number F _t (x _{dec, LO} (i)) and by the following formula (14) The obtained x' _{dec, LO} (i) is output as a low frequency signal whose time envelope shape has been corrected.

For example, when the time envelope shape of the low-frequency signal is determined to be flat, the time envelope shape of the low-frequency signal can be corrected by the following processing. For example, for the low frequency signal x _{dec, LO} (i), the predetermined function F _t (x _{dec, LO} (i)) is set to X' _{dec, LO} (i) is output as a low-frequency signal whose time envelope shape has been corrected.

Further, according to another example, the predetermined function F _t (x _{dec, LO} (i)) is _subjected to smoothing filter processing for the low frequency signals x _{dec, LO} (i).

Define (N _filt ≧ 1) and use x' _{dec, LO} (i) as the low-frequency signal whose time envelope shape has been corrected. An example in which the above-described time envelope shape is corrected to be flat can be implemented by combining the respective ones. The low-frequency time envelope correcting unit 10f performs a process of correcting the shape of the time envelope of the complex sub-band signal of the low-frequency signal to be flat, and is not limited to the above example.

Even, for example, when the time envelope shape of the low-frequency signal is determined to be raised, the time envelope shape of the low-frequency signal can be corrected by the following processing. For example, the defined function F _t (x _{dec, LO} (i)) is defined as a monotonically increasing function incr(i) for i. X' _{dec, LO} (i) is output as a low-frequency signal whose time envelope shape has been corrected. The low-frequency time envelope correcting unit 10f performs a process of correcting the shape of the time envelope of the complex sub-band signal of the low-frequency signal to be raised, and is not limited to the above example.

Even, for example, when the time envelope shape of the low-frequency signal is determined to be down, the time envelope shape of the low-frequency signal can be corrected by the following processing. For example, the defined function F _t (x _{dec, LO} (i)) is defined as a monotonically decreasing function decr(i) for i. X' _{dec, LO} (i) is output as a low-frequency signal whose time envelope shape has been corrected. The low-frequency time envelope correcting unit 10f performs a process of correcting the shape of the time envelope of the complex sub-band signal of the low-frequency signal to fall, and is not limited to the above example.

According to another example, the low frequency signal is a frequency domain conversion coefficient X _{dec, LO} (k) (0 ≦ k < by discrete Fourier transform, discrete cosine transform, modified discrete cosine transform to represent time-frequency conversion. When k _x ) is used, the function F _f (X _{dec, LO} (k)) is used. The obtained X' _{dec, LO} (k) is output as a conversion coefficient of the frequency domain of the low-frequency signal whose time envelope shape has been corrected.

For example, when the time envelope shape of the low-frequency signal is determined to be flat, the time envelope shape of the low-frequency signal can be corrected by the following processing.

Any of the M _LO bands representing the boundary at B _LO (m) (m = 0, ..., M _LO , M _LO ≧ 1) (B _LO (0) ≧ 0, B _LO (M _LO ) < k _x ) In the frequency band B _{dec, LO} (m), linear prediction is performed in the frequency direction to obtain a linear prediction coefficient α _p (m) (m = 0, ..., M _LO -1), and the predetermined function F _t (X _{dec, LO} (k)), set to perform linear prediction inverse filter processing on conversion coefficients X _{dec, LO} (k) Define (N _pred ≧1), and output X' _{dec, LO} (k, i) as the conversion coefficient of the low-frequency signal whose time envelope shape has been corrected.

Fig. 19 is a view showing the configuration of the speech encoding device 22 according to the third embodiment. The communication device of the speech encoding device 22 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 19, the voice encoding device 22 is functionally provided with a down-sampling unit 20a, a core encoding unit 20b, an analysis filter group unit 20c, a control parameter encoding unit 20d, an envelope calculation unit 20e, and quantization/ The coding unit 20f, the time envelope calculation units 22a and 22a1, the time envelope information coding unit 22b, the code sequence multiplex unit 20h, and the core decoding signal generation unit 20i.

Fig. 20 is a flowchart showing the operation of the speech encoding device 22 according to the third embodiment.

The time envelope calculation unit 22a calculates the time envelope of the down-sampled signal obtained from the down-clock sampling unit 20a (step 22-1).

For example, the time envelope E _LO (i) of the downsampled signal x _LO (i) in any time segment t _{t, E} (l) ≦ i < t _{t, E} (l+1)) can be The method of normalizing the frequency of the downsampled signal in the time zone is calculated.

The time envelope of the down-sampled signal is not limited to the previous example as long as it is a parameter that knows the change in the time direction of the down-sampling signal.

The time envelope calculation unit 22a1 calculates the time envelope of the core decoded signal generated by the core decoded signal generation unit 20i (step 22-2). The time envelope of the core decoded signal can be calculated in the same manner as the time envelope of the down-sampled signal.

For example, the time envelope E _{dec, LO} (i) of the pre-core decoding signal x _{dec, LO} (i) in any time segment t _{t, E} (l) ≦ i < t _{t, E} (l+1)) The calculation is performed in such a manner that the power of the core decoded signal that has been normalized in the current time zone is calculated.

The time envelope of the core decoding signal is not limited to the previous example as long as it is a parameter that knows the change in the time direction of the size of the core decoding signal.

The time envelope information encoding unit 22b calculates the time envelope information using the time envelope of the down-sampled signal calculated by the time envelope calculation unit 22a and the time envelope of the core decoded signal calculated by the time envelope calculation unit 22a1. The time envelope information is encoded by the time envelope (step S22-3).

For example, the time envelope information encoding unit 22b calculates information indicating the degree of flatness of the time envelope information. For example, the dispersion of the time envelope of the downsampled signal and the core decoded signal or a parameter similar thereto is calculated. In another example, the ratio of the summed average to the multiplied average of the time envelope of the subband signal of the downsampled signal and the core decoded signal or a parameter similar thereto is calculated. In this case, the time envelope information encoding unit 22b is only required to calculate the flatness indicating the flatness of the time envelope of the down-sampled signal as the time envelope information, and is not limited to the example of the foregoing. Then, encode the pre-recorded parameters. For example, the difference value of the down-sampled signal and the parameter of the core decoded signal or its absolute value is encoded. Then, for example, the value or absolute value of the parameter of the downsampled signal is encoded. For example, if the flatness of the time envelope is to be flattened, it can be encoded with 1 bit, for example, for any time zone beforehand. Segments can be encoded with 1 bit. The encoding method of the time envelope information is not limited to the pre-recording example.

For example, the time envelope information encoding unit 22b calculates information indicating the degree of rise of the time envelope information. For example, in any of the time segments t _{t, E} (l) ≦ i < t _{t, E} (l+1), the maximum value of the difference value in the time direction of the time envelope of the downsampled signal is calculated.

[ _Equation 23] d _{ELO ,max} ( l )=max( E _LO ( i )- E _LO ( i -1)) d _{Edec , LO ,max} ( l )=max( E _{dec , LO} ( i )- E _{dec , LO} ( i -1)) These are called equations (23). Even in the equation (23), instead of the time envelope, the maximum value of the difference value in the time direction in which the time envelope is smoothed in the time direction can be calculated. In this case, the time envelope information encoding unit 22b is only required to calculate the information indicating the degree of increase in the time envelope of the down-sampled signal as the time envelope information, and is not limited to the example of the foregoing. Then, encode the pre-recorded parameters. For example, the difference value of the down-sampled signal and the parameter of the core decoded signal or its absolute value is encoded. For example, if the degree of rise of the time envelope is to be expressed by whether it is up, it can be encoded by 1 bit. For example, for any preceding time segment, it can be encoded by 1 bit. The encoding method of the time envelope information is not limited to the pre-recording example.

Even, for example, the time envelope information encoding unit 20g calculates information indicating the degree of decline in the time envelope information. For example, in any of the time segments t _{t, E} (l) ≦ i < t _{t, E} (l+1), the minimum value of the difference value in the time direction of the time envelope of the sub-band signal of the low-frequency signal is calculated.

[ _Equation 24] d _{ELO ,min} ( l )=min( E _LO ( i )- E _LO ( i -1)) d _{Edec , LO ,min} ( l )=min( E _{dec , LO} ( i )- E _{dec , LO} ( i -1)) These are called equations (24). Even in the equation (24), instead of the time envelope, the minimum value of the difference value in the time direction in which the time envelope is smoothed in the time direction can be calculated. In this case, the time envelope information encoding unit 22b is only required to calculate the information indicating the degree of decline in the time envelope of the down-sampled signal as the time envelope information, and is not limited to the example of the foregoing. Then, encode the pre-recorded parameters. For example, the difference value of the down-sampled signal and the parameter of the core decoded signal or its absolute value is encoded. For example, if the degree of decline of the time envelope is to be expressed by whether it is down, it can be encoded by 1 bit, for example, for any preceding time segment, it can be encoded by 1 bit. The encoding method of the time envelope information is not limited to the pre-recording example.

In the case of calculating the information indicating the degree of flatness, the degree of rise, and the degree of decline as the pre-recorded time envelope information, only one of the time envelopes of the down-sampling signal and the core decoded signal is used, and only a slight Each part of the calculation of the other time envelope and each process.

[First Modification of Voice Encoding Device According to Third Embodiment]

Fig. 21 is a view showing the configuration of a first modification 22A of the speech encoding device according to the third embodiment.

Fig. 22 is a flowchart showing the operation of the first modification 22A of the speech encoding device according to the third embodiment.

The time envelope information encoding unit 22bA calculates the time envelope information based on the time envelope of the down-sampled signal calculated by the time envelope calculation unit 22a, and encodes the time envelope information (step S22-3a).

For example, as time envelope information, information indicating the flatness of the shape of the time envelope is calculated. For example, the downsampled signal x _LO (i)(t _t,E (l)≦i< in any time segment t _t,E (l)≦i<t _t,E (l+1)) The time envelope E _LO (i) of t _t,E (l+1)) is calculated by equation (21). Further, the method of calculating the time envelope E _LO (i) is not limited to the formula (21). The dispersion of the time envelope E _LO (i) or a parameter similar thereto is calculated, and the parameter is encoded. In still other examples, the ratio of the sum average of the time envelope E _LO (i) to the multiplied average or a parameter similar thereto is calculated, and the parameter is encoded. The method of calculating the information indicating the flatness of the time envelope shape of the down-sampled signal is not limited to the above example.

For example, information indicating the degree of elevation of the temporal envelope shape is calculated as time envelope information. For example, the difference value in the time direction of the time envelope E _LO (i) is calculated, and the maximum value of the difference value in an arbitrary time zone is calculated and encoded. The method of calculating the information on the degree of rise of the time envelope shape of the down-sampled signal is not limited to the above example.

Even for example, information indicating the degree of decline in the shape of the time envelope is calculated as time envelope information. For example, the difference value in the time direction of the time envelope E _LO (i) is calculated, and the minimum value of the difference value in an arbitrary time zone is calculated and encoded. The method of calculating the information indicating the degree of decline in the time envelope shape of the down-sampled signal is not limited to the above example.

[Second Modification of Voice Encoding Device According to Third Embodiment]

Fig. 23 is a view showing the configuration of a second modification 22B of the speech encoding device according to the third embodiment.

Fig. 24 is a flowchart showing the operation of the second modification 22B of the speech encoding device according to the third embodiment.

The time envelope calculation unit 22aB calculates a time envelope of the input audio signal (step 22-1b).

For example, the time envelope E(i) of the pre-recorded signal x(i) in any time segment t _t,E (l)≦i<t _t,E (l+1)) may be input in the time zone. The method of normalizing the input signal power in the segment is calculated.

The time envelope of the input signal is not limited to the previous example as long as it is a parameter that knows the change of the time direction of the input signal.

The time envelope information encoding unit 22bB calculates the time envelope information based on the time envelope of the input audio signal calculated by the time envelope calculation unit 22aB, and encodes the time envelope information (step S22-3b).

For example, as time envelope information, information indicating the flatness of the shape of the time envelope is calculated. For example, the input signal x(i)(t _t,E (l)≦i<t _{t in} any time segment t _t,E (l)≦i<t _t,E (l+1)) _, The time envelope E(i) of _E (l+1)) is calculated by equation (25). Further, the method of calculating the time envelope E(i) is not limited to the equation (25). The dispersion of the time envelope E(i) or a parameter similar thereto is calculated, and the parameter is encoded. In another example, the ratio of the sum average of the time envelope E(i) to the multiplied average or a parameter similar thereto is calculated, and the parameter is encoded. The method of calculating the information indicating the flatness of the time envelope shape of the input signal is not limited to the above example.

For example, information indicating the degree of elevation of the temporal envelope shape is calculated as time envelope information. For example, the difference value in the time direction of the time envelope E(i) is calculated, and the maximum value of the difference value in an arbitrary time zone is calculated and encoded. The method of calculating the information indicating the degree of rise of the time envelope shape of the input signal is not limited to the above example.

Even for example, information indicating the degree of decline in the shape of the time envelope is calculated as time envelope information. For example, the difference value in the time direction of the time envelope E(i) is calculated, and the minimum value of the difference value in an arbitrary time zone is calculated and encoded. The method of calculating the information indicating the degree of decline in the time envelope shape of the input signal is not limited to the above example.

The first, second, and third modifications of the first embodiment of the present invention can be applied to the low-frequency envelope shape determining unit 10e of the third embodiment, and it is needless to say that there is no doubt.

[Fourth embodiment]

Fig. 25 is a view showing the configuration of the sound decoding device 13 according to the fourth embodiment. The communication device of the sound decoding device 13 will record the sound from below The multiplexed code sequence output by the encoding device 23 is received, and then the decoded audio signal is output to the outside. As shown in FIG. 25, the audio decoding device 13 is functionally provided with a coded sequence inverse multiplexing unit 10aA, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analyzing unit 13c, and a high frequency time envelope shape. The determination unit 13a, the time envelope correction unit 13b, the high-frequency signal generation unit 10g, the decoding/inverse quantization unit 10h, the frequency envelope adjustment unit 10i, and the synthesis filter group unit 10j.

Fig. 26 is a flowchart showing the operation of the sound decoding device 13 according to the fourth embodiment.

The code sequence analysis unit 13c analyzes the band extension portion of the code sequence divided by the coded sequence inverse multiplexing unit 10aA, and divides it into a high frequency signal generation unit 10g, a decoding/inverse quantization unit 10h, and a high frequency time envelope. Information necessary for the shape determining unit 13a (step S13-3).

The high-frequency time envelope shape determining unit 13a receives information on the shape of the high-frequency envelope from the code sequence analyzing unit 13c, and determines the time envelope shape of the high-frequency signal based on the information (step S13-1). For example, the time envelope shape of the high frequency signal is determined to be flat. Even for example, the time envelope shape of the high frequency signal is determined to rise. Even for example, the time envelope shape of the high frequency signal is determined to be down.

The time envelope correction unit 13b is output from the analysis filter group unit 10c and used in the high-frequency signal generation unit 10g for the high-frequency signal based on the time envelope shape determined by the high-frequency time envelope shape determination unit 13a. The time envelope of the complex sub-band signal of the generated low-frequency signal The shape is corrected (step S13-2).

For example, when the time envelope shape of the current high-frequency signal is determined to be flat, for example, for the low-frequency signal generated by the high-frequency signal, the time envelope shape of the low-frequency signal is changed by the low-frequency time envelope correcting unit 10f. Flat processing The same processing can correct the time envelope shape of the low frequency signal to be used for the generation of the high frequency signal.

Even, for example, when the time envelope shape of the current high-frequency signal is determined to be raised, for example, the same processing as the processing of the time envelope shape of the low-frequency signal of the low-frequency time is performed by the low-frequency time envelope correcting unit 10f, and the correction can be corrected. The time envelope shape of the low frequency signal to be generated by the high frequency signal is utilized.

Even, for example, when the time envelope shape of the current high-frequency signal is determined to be set down, for example, the same processing as the process of reducing the time envelope shape of the low-frequency signal of the low-frequency signal by the low-frequency time envelope correcting unit 10f can be corrected. The time envelope shape of the low frequency signal to be generated by the high frequency signal is utilized.

The processing of correcting the temporal envelope shape of the low-frequency signal to be used for the generation of the high-frequency signal is not limited to the above example.

Fig. 27 is a view showing the configuration of the speech encoding device 23 according to the fourth embodiment. The communication device of the audio encoding device 23 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 27, the voice encoding device 23 is functionally provided with a down-sampling unit 20a, a core encoding unit 20b, analysis filter group units 20c and 20c1, and a control parameter encoding unit. 20d, envelope calculation unit 20e, quantization/encoding unit 20f, time envelope information encoding unit 23a, code sequence multiplexing unit 20h, sub-band signal power calculation unit 20j, and core decoding signal generation unit 20i.

Fig. 28 is a flowchart showing the operation of the speech encoding device 23 according to the fourth embodiment.

The time envelope information encoding unit 23a calculates at least one of a time envelope of the low-frequency signal used for generating the high-frequency signal and a time envelope of the high-frequency signal, and then calculates the time envelope signal calculation unit 20j. The power of the sub-band signal of the core decoding signal is used to calculate the time envelope of the core decoding signal, and the time envelope is based on the time envelope of the low-frequency signal and the time envelope of the high-frequency signal and the time envelope of the core decoding signal. The information is encoded (step S23-1). The time envelope of the low frequency signal is the time envelope of the low frequency signal calculated using the power of the subband signal of the low frequency signal calculated by the envelope calculation unit 20e. The time envelope of the high frequency signal is the time envelope of the high frequency signal calculated using the power of the subband signal of the high frequency signal calculated by the envelope calculation unit 20e. In the processing, if the power of the sub-band signal of the low-frequency signal is not calculated, the power of the sub-band signal of the low-frequency signal can be calculated in the time envelope information encoding unit 23a, and the power of the sub-band signal of the low-frequency signal is calculated, and No limit. Even if the power of the sub-band signal of the high-frequency signal is not calculated, the power of the sub-band signal of the high-frequency signal can be calculated by the time envelope information encoding unit 23a, and the power of the sub-band signal of the high-frequency signal is calculated, and No limit.

For example, it is calculated by the time envelope information encoding unit 20g. The same processing as the time envelope of the low-frequency signal can be used to calculate the time envelope of the low-frequency signal used in the generation of the high-frequency signal. The time envelope of the sub-band signal of the low-frequency signal used for generating the high-frequency signal is not limited to the pre-recorded example as long as it is a parameter that knows the fluctuation of the time direction of the sub-band signal of the low-frequency signal.

Further, for example, by performing the same processing as the processing of the time envelope of the high-frequency signal before the time envelope information encoding unit 21a, the time envelope of the high-frequency signal can be calculated. The time envelope of the sub-band signal of the high-frequency signal is not limited to the pre-recorded example as long as it is a parameter that knows the change in the time direction of the size of the sub-band signal of the high-frequency signal.

For example, in the process of calculating the information indicating the flatness of the time envelope information, the time envelope information encoding unit 20g can replace the time envelope of the low-frequency signal sub-band signal of the pre-recording, and use the low-frequency signal used for the generation of the high-frequency signal. The time envelope of the band signal, whereby information indicating the degree of flatness can be calculated as time envelope information, and the time envelope information can be encoded. In addition, for example, in the process of calculating the information indicating the flatness of the time envelope information, the time envelope information encoding unit 20g can replace the time envelope of the sub-band signal of the low-frequency signal with the time envelope of the sub-band signal of the high-frequency signal. Thereby, information indicating the degree of flatness can be calculated as time envelope information, and the time envelope information can be encoded. For example, if the flatness of the time envelope is expressed as flat, it can be encoded with 1 bit.

Even, for example, the time envelope information encoding unit 20g calculates the information indicating the degree of rise of the time envelope information, and can replace the former Recording the time envelope of the low-frequency signal sub-band signal, using the time envelope of the sub-band signal of the low-frequency signal used in the generation of the high-frequency signal, thereby calculating the information indicating the degree of rise as the time envelope information, and The time envelope information should be encoded. Further, for example, in the process of calculating the information indicating the degree of rise of the time envelope information, the time envelope information encoding unit 20g can replace the time envelope of the low-frequency signal sub-band signal of the pre-recorded low-frequency signal, and use the time envelope of the sub-band signal of the high-frequency signal. Thereby, information indicating the degree of rise can be calculated as time envelope information, and the time envelope information can be encoded. For example, if the rise of the time envelope is expressed by whether it is up, it can be encoded by 1 bit.

In addition, for example, the time envelope information encoding unit 20g calculates the time envelope of the low-frequency signal sub-band signal in the process of calculating the information indicating the degree of decline of the time envelope information, and instead uses the low-frequency used in the generation of the high-frequency signal. The time envelope of the sub-band signal of the signal, by which information indicating the degree of dampness can be calculated as time envelope information, and the time envelope information can be encoded. Even, for example, the time envelope information encoding unit 20g calculates the time envelope of the sub-band signal of the low-frequency signal sub-band signal in the process of calculating the information indicating the degree of decline of the time envelope information, and uses the time envelope of the sub-band signal of the high-frequency signal. In this way, information indicating the degree of decline can be calculated as time envelope information, and the time envelope information can be encoded. For example, if the degree of decline in the time envelope is expressed by whether it is down, it can be encoded by 1 bit.

Further, the method of calculating the time envelope information and the encoding method are not limited to the foregoing examples.

[First Modification of Sound Decoding Device According to Fourth Embodiment]

Fig. 29 is a view showing the configuration of a first modification 13A of the speech decoding device according to the fourth embodiment.

Fig. 30 is a flowchart showing the operation of the first modification 13A of the speech decoding device according to the fourth embodiment.

The high-frequency time envelope shape determining unit 13aA receives the low-frequency signal from the core decoding unit 10b, and determines the high-frequency time envelope shape based on the low-frequency signal (step S13-1a).

For example, the time envelope of the low frequency signal is calculated, and the high frequency time envelope shape is determined based on the shape of the low frequency time envelope. Even, for example, the time envelope of the signal after the predetermined processing of the low frequency signal is calculated, and the shape of the high frequency time envelope is determined based on the shape of the time envelope of the processed low frequency signal. The predetermined processing is, for example, a high-pass filter processing, but is not limited thereto.

For example, the time envelope shape of the high frequency signal is determined to be flat. For example, similarly to the low-frequency envelope shape determining unit 10eA, the temporal envelope shape of the high-frequency signal is determined to be flat, in the same manner as the temporal envelope shape of the low-frequency signal is determined to be flat. Then, the low-frequency time envelope shape determining unit 10eA determines the time envelope shape of the pre-recorded low-frequency signal into a flat process, and can replace the time envelope of the pre-recorded low-frequency signal to use the time envelope of the low-frequency signal that has been processed before, and the high-frequency signal is used. The time envelope shape is determined to be flat. The time envelope shape of the high-frequency signal is determined to be a flat process, and is not limited to the above example.

Even for example, the time envelope shape of the high frequency signal is determined to rise. For example, similarly to the process of determining the temporal envelope shape of the low-frequency signal to be raised, the low-frequency envelope shape determining unit 10eA determines the temporal envelope shape of the high-frequency signal to rise. Then, the low-frequency time envelope shape determining unit 10eA determines the time envelope shape of the low-frequency signal to be raised, and replaces the time envelope of the low-frequency signal with the time envelope, and uses the time envelope of the low-frequency signal processed beforehand to change the high-frequency signal. The time envelope shape is determined to be a process of increasing the temporal envelope shape of the high-frequency signal to be raised, and is not limited to the above example.

Even for example, the time envelope shape of the high frequency signal is determined to be down. For example, similarly to the process of determining the time envelope shape of the low-frequency signal of the low-frequency time, the low-frequency envelope shape determining unit 10eA determines the time envelope shape of the high-frequency signal to fall. Then, the low-frequency time envelope shape determining unit 10eA determines the time envelope shape of the pre-recorded low-frequency signal as a process of falling down, and can replace the time envelope of the low-frequency signal of the preceding note, and use the time envelope of the low-frequency signal that has been processed before, and the high-frequency signal is used. The shape of the envelope of time is determined to fall. The process of determining the time envelope shape of the high-frequency signal as a fall is not limited to the above example.

[Second Modification of Sound Decoding Device According to Fourth Embodiment]

Fig. 31 is a view showing the configuration of a second modification 13B of the speech decoding device according to the fourth embodiment.

The high-frequency time envelope shape determining unit is different from the first modification 13A of the audio decoding device according to the fourth embodiment. 13aB is a complex sub-band signal for receiving a low-frequency signal from the analysis filter bank unit 10c, and determines a time envelope shape of the high-frequency signal based on the complex sub-band signal of the low-frequency signal (corresponding to the processing of step S13-1a).

For example, the time envelope of the sub-band signal of at least one of the low-frequency signals is calculated, and the high-frequency time envelope shape is determined based on the shape of the low-frequency sub-band signal time envelope.

For example, the time envelope shape of the high frequency signal is determined to be flat. For example, similarly to the low-frequency envelope shape determining unit 10eB, the temporal envelope shape of the high-frequency signal is determined to be flat, in the same manner as the temporal envelope shape of the low-frequency signal is determined to be flat. At this time, B _LO (m) indicating the boundary of the frequency band is designed to be different from the low-frequency time envelope shape determining unit 10eB, for example, by defining only a relatively high-frequency band or the like. The time envelope shape of the high-frequency signal is determined to be a flat process, and is not limited to the above example.

Even for example, the time envelope shape of the high frequency signal is determined to rise. For example, the low-frequency envelope shape determining unit 10eB can determine the temporal envelope shape of the high-frequency signal to be raised in the same manner as the process of determining the temporal envelope shape of the low-frequency signal. At this time, B _LO (m) indicating the boundary of the frequency band is designed to be different from the low-frequency time envelope shape determining unit 10eB, for example, by defining only a relatively high-frequency band or the like. The process of determining the temporal envelope shape of the high-frequency signal to be raised is not limited to the above example.

Even for example, the time envelope shape of the high frequency signal is determined to be down. For example, the low-frequency envelope shape determining unit 10eB can determine the temporal envelope shape of the high-frequency signal to fall in the same manner as the process of determining the temporal envelope shape of the low-frequency signal. At this time, B _LO (m) indicating the boundary of the frequency band is designed to be different from the low-frequency time envelope shape determining unit 10eB, for example, by defining only a relatively high-frequency band or the like. The process of determining the time envelope shape of the high-frequency signal as a fall is not limited to the above example.

[Third Modification of Sound Decoding Device According to Fourth Embodiment]

Fig. 32 is a view showing the configuration of a third modification 13C of the voice decoding device according to the fourth embodiment.

The high-frequency time envelope shape determining unit 13aC is a plurality of sub-bands of the high-frequency time envelope shape information from the code sequence analyzing unit 13c, the low-frequency signal from the core decoding unit 10b, and the low-frequency signal from the analysis filter group unit 10c. At least one of the signals is charged to determine the time envelope shape of the high frequency signal (corresponding to the processing of step S13-1).

For example, the time envelope of the sub-band signal of at least one of the low-frequency signals is calculated, and the high-frequency time envelope shape is determined based on the shape of the low-frequency sub-band signal time envelope.

For example, the time envelope shape of the high frequency signal is determined to be flat. In this case, at least one or more of the methods of determining the temporal envelope shape of the high-frequency signal described in the audio decoding device according to the fourth embodiment and the first and second modifications of the decoding device are determined. The shape of the time envelope is determined to be flat. Time envelope of high frequency signal The method of determining the shape to be flat is not limited to the above.

For another example, the time envelope shape of the high frequency signal is determined to rise. In this case, at least one or more of the methods of determining the temporal envelope shape of the high-frequency signal described in the first and second modifications of the decoding apparatus according to the fourth embodiment of the present invention are combined. The shape of the time envelope is determined to rise. The method of determining the time envelope shape of the high-frequency signal to be raised is not limited to the above.

Even for example, the time envelope shape of the high frequency signal is determined to be down. In this case, at least one or more of the methods for determining the temporal envelope shape of the high-frequency signal described in the first and second modifications of the decoding apparatus according to the fourth embodiment of the present invention are combined. The shape of the time envelope is determined to fall. The method of determining the time envelope shape of the high-frequency signal as a fall is not limited to the above.

[First Modification of the Voice Encoding Device of the Fourth Embodiment]

Fig. 33 is a view showing the configuration of a first modification 23A of the speech encoding device according to the fourth embodiment.

Fig. 34 is a flowchart showing the operation of the first modification 23A of the speech encoding device according to the fourth embodiment.

The time envelope information encoding unit 23aA calculates at least one of a time envelope of the low frequency signal and a time envelope of the high frequency signal, and calculates the time by at least one of the time envelope of the low frequency signal and the high frequency signal. The envelope information is encoded and encoded (step S23-1a). The time envelope of the low frequency signal is calculated using the low calculated in the envelope calculation unit 20e. The power of the sub-band signal of the frequency signal is used to calculate the time envelope of the low-frequency signal. The time envelope of the high frequency signal is the time envelope of the high frequency signal calculated using the power of the subband signal of the high frequency signal calculated by the envelope calculation unit 20e. In the processing, if the power of the sub-band signal of the low-frequency signal is not calculated, the power of the sub-band signal of the low-frequency signal can be calculated by the time envelope information encoding unit 23aA, and the power of the sub-band signal of the low-frequency signal is calculated. There is no limit. Even if the power of the sub-band signal of the high-frequency signal is not calculated, the power of the sub-band signal of the high-frequency signal can be calculated by the time envelope information encoding unit 23aA, and the power of the sub-band signal of the high-frequency signal is calculated. There is no limit.

For example, as time envelope information, information indicating the flatness of the shape of the time envelope is calculated. For example, in any period of time t _E (l) ≦ i < t _E (l+1), divide into B _LO (m) (m = 0, ..., M _LO , M _LO ≧ 1) (B _LO (0) ≧0, B _LO (M _LO )<k _x ) represents the M _LO frequency band of the boundary, and the sub-band signal X _LO (k, i) of the low-frequency signal contained in the m-th frequency band (B _LO (m The time envelope E _LO (k, i) of ≦k < B _LO (m+1), t _E (l) ≦ i < t _E (l+1)), is calculated by the equation (7). Further, the method of calculating the time envelope E _LO (k, i) is not limited to the formula (7). The dispersion of the time envelope E _LO (k, i) or a parameter similar thereto is calculated, and the parameter is encoded. In still other examples, the ratio of the sum average of the time envelope E _LO (k, i) to the multiplied average or a parameter similar thereto is calculated, and the parameter is encoded. Even, for example, in any period of time t _E (l) ≦ i < t _E (l + 1), it is divided into B _HI (m) (m = 0, ..., M _HI , M _H ≧ 1) ( B _HI (0) ≧ k _x , B _HI (M _HI ) < k _h ) represents the M _HI frequency bands of the boundary, and the sub-band signal X _HI (k, i) of the high-frequency signal contained in the m-th frequency band ( B _HI (m) ≦k<B _HI (m+1), t _E (l)≦i<t _E (l+1)) The time envelope E _HI (k,i) is calculated by equation (11) . Further, the method of calculating the time envelope E _HI (k, i) is not limited to the formula (11). The dispersion of the time envelope E _HI (k, i) or a parameter similar thereto is calculated, and the parameter is encoded. In another example, the ratio of the sum average of the time envelope E _HI (k, i) to the multiplied average or a parameter similar thereto is calculated, and the parameter is encoded. The method of calculating the information indicating the flatness of the temporal envelope shape is not limited to the above example.

For example, information indicating the degree of elevation of the temporal envelope shape is calculated as time envelope information. For example, the difference value in the time direction of the time envelope E _LO (k, i) is calculated, and the maximum value of the difference value in an arbitrary time zone is calculated and encoded. Even, for example, the difference value in the time direction of the time envelope E _HI (k, i) is calculated, and the maximum value of the difference value in an arbitrary time zone is calculated and encoded. The method of calculating the information indicating the degree of rise of the time envelope shape is not limited to the above example.

Even for example, information indicating the degree of decline in the shape of the time envelope is calculated as time envelope information. For example, the difference value in the time direction of the time envelope E _LO (k, i) is calculated, and the minimum value of the difference value in an arbitrary time zone is calculated and encoded. Even, for example, the difference value in the time direction of the time envelope E _HI (k, i) is calculated, and the minimum value of the difference value in an arbitrary time zone is calculated and encoded.

Further, the method of calculating the information indicating the degree of decline in the shape of the time envelope is not limited to the above example. In the example of calculating the degree of flatness, the degree of rise, and the degree of descent as the pre-recorded time envelope information, only the sub-band signals of the low-frequency signal and the high-frequency signal are used. In the case of one of the time envelopes, it is possible to save each part and each process which only slightly involves the calculation of the other time envelope.

[Fifth Embodiment]

Fig. 35 is a view showing the configuration of the sound decoding device 14 according to the fifth embodiment. The communication device of the audio decoding device 14 receives the multiplexed code sequence output from the lower voice encoding device 24, and outputs the decoded audio signal to the outside. As shown in FIG. 35, the audio decoding device 14 is functionally provided with a code sequence inverse multiplexing unit 10aA, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analyzing unit 13c, and a high frequency signal generating unit. 10g, high-frequency time envelope shape determining unit 13a, time envelope correcting unit 14a, decoding/inverse quantization unit 10h, frequency envelope adjusting unit 10i, and synthesis filter group unit 10j.

Fig. 36 is a flow chart showing the operation of the sound decoding device 14 according to the fifth embodiment.

The time envelope correction unit 14a corrects the shape of the time envelope of the complex sub-band signal of the high-frequency signal output from the high-frequency signal generating unit 10g based on the time envelope shape determined by the high-frequency time envelope shape determining unit 13a ( Step S14-1).

For example, in any period of time t _E (l) ≦ i < t _E (l + 1), it is divided into B _{gen, HI} (m) (m = 0, ..., M _{gen, HI} , M _{gen, HI} ≧1)(B _gen,HI (0)≧k _x ,B _gen,HI (M _gen,HI )<k _h ) denotes the M _HI bands of the boundary, for the high frequency signals contained in the mth band _Subband signal X _{gen, HI} (k, i) of the high frequency signal output by the generating unit 10g (B _HI (m) ≦ k < B _HI (m+1), t _E (l) ≦ i < t _E (l +1)), using the specified function F(X _{gen, HI} (k, i)), and by the following equation (26)

The obtained X' _{gen, HI} (k, i) is output as a sub-band signal of the high-frequency signal whose time envelope shape has been corrected.

For example, when the time envelope shape of the high-frequency signal is determined to be flat, the time envelope shape of the high-frequency signal can be corrected by the following processing. For example, the sub-band signal X _{gen, HI} (k, i) is divided into B _{gen, HI} (m) (m = 0, ..., M _HI , M _HI ≧ 1) (B _{gen, HI} (0) ≧ k _x , B _{gen, HI} (M _HI )<k _h ) represent the M _HI bands of the boundary, for the sub-band signals X _{gen, HI} (k, i) (B _HI (m) ≦) contained in the m-th band k<B _HI (m+1), t _E (l)≦i<t _E (l+1)), set the predetermined function F(X _{gen, HI} (k, i)) to or, (These are called equations (27).) X' _{gen, HI} (k, i) is output as a sub-band signal of the high-frequency signal whose time envelope shape has been corrected. Further, according to another example, the predetermined function F(X _{gen, HI} (k, i)) is subjected to smoothing filter processing for the sub-band signals X _{gen, HI} (k, i). The definition is (N _filt ≧ 1), and X' _{gen, HI} (k, i) is output as a sub-band signal of the high-frequency signal whose time envelope shape has been corrected. Then, in the respective frequency bands indicating the boundary before the use of B _{gen and HI} (m), the process of making the power of the sub-band signals before and after the filter processing become uniform can be performed. According to another example, the sub-band signal X _{gen, HI} (k, i) is linearly predicted in the frequency direction to obtain a linear prediction coefficient in each frequency band in which the B _{gen, HI} (m) is used before the use. α _p (m) (m = 0, ..., M _HI -1), linearize the sub-band signal X _{gen, HI} (k, i) by the defined function F(X _{gen, HI} (k, i)) Predictive inverse filter processing.

The definition is (N _pred ≧1), and X' _{gen, HI} (k, i) is output as a sub-band signal of the high-frequency signal whose time envelope shape has been corrected.

An example in which the above-described time envelope shape is corrected to be flat can be implemented by combining the respective ones. The time envelope correcting unit 14a performs a process of correcting the shape of the time envelope of the complex sub-band signals of the high-frequency signal to be flat, and is not limited to the above example.

Even, for example, when the time envelope shape of the high-frequency signal is determined to be raised, the time envelope shape of the high-frequency signal can be corrected by the following processing. For example, the defined function F(X _{gen, HI} (k, i)) is defined as a monotonically increasing function incr(i) for i. X' _{gen, HI} (k, i) is output as a sub-band signal of the high-frequency signal whose time envelope shape has been corrected. Then, in the respective frequency bands indicating the boundary before the use of B _{gen and HI} (m), the process of matching the power of the sub-band signals before and after the correction of the time envelope shape can be performed.

The time envelope correcting unit 14a performs a process of correcting the shape of the time envelope of the complex sub-band signal of the high-frequency signal to be raised, and is not limited to the above example.

Even, for example, when the time envelope shape of the high-frequency signal is determined to be set down, the time envelope shape of the high-frequency signal can be corrected by the following processing. For example, the defined function F(X _{gen, HI} (k, i)) is defined as a monotonically decreasing function decr(i) for i. X' _{gen, HI} (k, i) is output as a sub-band signal of the high-frequency signal whose time envelope shape has been corrected. Then, in the respective frequency bands indicating the boundary before the use of B _{gen and HI} (m), the process of matching the power of the sub-band signals before and after the correction of the time envelope shape can be performed.

The time envelope correcting unit 14a performs a process of correcting the shape of the time envelope of the complex sub-band signal of the high-frequency signal to fall, and is not limited to the above example.

In addition, when the frequency envelope adjustment unit 10i of the present embodiment is implemented by "HF adjustment" in "SBR" and "Low Delay SBR" as defined by "ISO/IEC 14496-3", the time envelope correction unit The processing of 14a can be performed in the frequency envelope adjusting unit 10i, whereby the amount of calculation can be reduced. Specifically, for example, when the time envelope shape is corrected by the equation (27), the power of the sub-band signal of the high-frequency signal in the equation (27) [number 32]| X _{gen, HI} ( j , n )| ² The calculation is calculated because it is calculated in the previous paragraph "HF adjustment", so it can be omitted. Even when "interpolation" is not used in the previous "HF adjustment" (that is, when bs_interpol_freq = 0), the sum of the frequency directions of the power of the sub-band signals of the high-frequency signal in the equation (27) The calculation is calculated because it is calculated in the previous paragraph "HF adjustment", so it can be omitted.

On the other hand, in the preface "HF adjustment", the sum of the "interpolation" is used in the sum of the time directions. When it is calculated, the sum of the above can be calculated as the "HF adiustment" The amount of substitution or the approximate amount is used, and the calculation amount can be reduced by omitting the calculation of the sum.

Even in the other examples of the time envelope correction unit 14a, the partial processing can be omitted in the same manner, and there is no doubt.

In addition, the first, second, and third modifications of the audio decoding device according to the fourth embodiment of the present invention are applicable to the high-frequency envelope shape determining unit 13a of the audio decoding device 14 according to the present embodiment. There is no doubt that.

Fig. 37 is a view showing the configuration of the voice encoding device 24 according to the fifth embodiment. The communication device of the audio encoding device 24 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 37, the voice encoding device 24 is functionally provided with a down-sampling unit 20a, a core encoding unit 20b, an analysis filter group unit 20c, a control parameter encoding unit 20d, an envelope calculation unit 20e, and quantization/ The coding unit 20f, the pseudo-frequency signal generation unit 24a, the sub-band signal power calculation unit 24b, the time envelope information coding unit 24c, and the code sequence multiplex unit 20h.

Fig. 38 is a flow chart showing the operation of the speech encoding device 24 according to the fifth embodiment.

The pseudo-high-frequency signal generating unit 24a generates a sub-band signal based on the low-frequency signal of the input audio signal obtained by the analysis filter group unit 20c, and the high-frequency signal obtained by the control parameter encoding unit 20d. The control parameters are required to generate a pseudo high frequency signal (step S24-1). The process of generating the pseudo-high-frequency signal is performed in the same manner as the processing in the high-frequency signal generating unit 10g, but is based on the sub-band signal of the low-frequency signal decoded by the core decoding unit 10b in the high-frequency signal generating unit 10g. This is generated by the pseudo-high-frequency signal generating unit 24a, which is generated from the sub-band signal of the low-frequency signal to which the audio signal is input. Further, in the pseudo-high-frequency signal generating unit 24a, for the purpose of reducing the amount of calculation, part of the processing in the high-frequency signal generating unit 10g can be omitted. For example, the adjustment processing of the tonality of the generated high frequency signal can be omitted.

The sub-band signal power calculation unit 24b calculates the power of the sub-band signal of the pseudo-high-frequency signal generated by the pseudo-frequency signal generating unit 24a (step S24-2).

The time envelope information encoding unit 24c calculates the time envelope of the high frequency signal using the power of the subband signal of the high frequency signal calculated by the envelope calculation unit 20e, and uses the pseudo frequency signal calculated by the subband signal power calculation unit 24b. The power of the sub-band signal is used to calculate a time envelope of the pseudo-high frequency signal, and the time envelope information is calculated and encoded by the time envelope of the high-frequency signal and the time envelope of the pseudo-high frequency signal (step S24-3). In the processing, if the power of the sub-band signal of the high-frequency signal is not calculated, the power of the sub-band signal of the high-frequency signal can be calculated in the time envelope information encoding unit 24c, and the power of the sub-band signal of the high-frequency signal is Calculated, there is no limit.

For example, the same processing as the processing of calculating the time envelope of the high-frequency signal by the time envelope information encoding unit 21a can be calculated. When the time envelope of the high frequency signal. The time envelope of the sub-band signal of the high-frequency signal is not limited to the pre-recorded example as long as it is a parameter that knows the change in the time direction of the size of the sub-band signal of the high-frequency signal.

For example, in any period of time t _E (l) ≦ i < t _E (l + 1), it is divided into B _{sim, gen, HI} (m) (m = 0, ..., M _{sim, gen, HI} , M _sim,gen,HI ≧1)(B _sim,gen,HI (0)≧k _x ,B _sim,gen,HI (M _sim,gen,HI )<k _h ) represents the M _{sim,gen,HI of the} boundary The frequency band, the sub-band of the pseudo-high frequency signal contained in the mth frequency band X _sim,gen,HI (k,i)(B _sim,gen,HI (m)≦k<B _sim,gen,HI ( The time envelope E _sim,gen,HI (k,i) of m+1),t _E (l)≦i<t _E (l+1)) is calculated.

The time envelope of the sub-band signal which is similar to the high-frequency signal is not limited to the pre-recorded example as long as it is a parameter that knows the variation of the time direction of the size of the sub-band signal which is intended to be a high-frequency signal.

For example, in the process of calculating the information indicating the flatness of the time envelope information, the time envelope information encoding unit 20g replaces the time envelope of the sub-band signal of the high-frequency signal instead of the time envelope of the sub-band signal of the low-frequency signal, and then replaces the pre-record The time envelope of the sub-band signal of the core decoded signal is changed to the time envelope of the sub-band signal which is like the high-frequency signal, whereby the information indicating the flatness can be calculated as the time envelope information, and the time envelope information can be encoded. For example, if the flatness of the time envelope is to be flattened, it can be encoded by 1 bit. For example, in the pre-recorded arbitrary time zone, the information can be recorded for each of the pre-recorded M _{sim, gen, and HI} bands. It is encoded in M _{sim, gen, HI} bits.

In addition, for example, the time envelope information encoding unit 20g calculates the time envelope of the sub-band signal of the high-frequency signal instead of the time envelope of the sub-band signal of the low-frequency signal, and then replaces the time envelope of the sub-band signal of the high-frequency signal. Instead of replacing the time envelope of the sub-band signal of the pre-core decoding signal, the time envelope of the sub-band signal that is like the high-frequency signal is used, thereby calculating the information indicating the degree of rising as the time envelope information, and encoding the time envelope information. . For example, if you want to express the increase of the time envelope by whether you are up, you can use 1 bit to encode. For example, you can use the information in the pre-recorded M _{sim, gen, HI} for each time zone. It is encoded in M _{sim, gen, HI} bits.

Even, for example, the time envelope information encoding unit 20g calculates the time envelope of the sub-band signal of the high-frequency signal instead of the time envelope of the sub-band signal of the low-frequency signal, and then replaces the time envelope of the sub-band signal of the high-frequency signal. Instead of replacing the time envelope of the sub-band signal of the pre-core decoding signal, the time envelope of the sub-band signal that is like the high-frequency signal is used, thereby calculating the information indicating the degree of the fall as the time envelope information, and encoding the time envelope information. . For example, if you want to show whether the time envelope is down or down, you can use 1 bit to encode. For example, you can use the information in the pre-recorded M _{sim, gen, and HI} bands in any of the preceding time segments. It is encoded in M _{sim, gen, HI} bits.

Further, the method of calculating the time envelope information and the encoding method are not limited to the foregoing examples. Further, the first modification of the speech encoding device according to the fourth embodiment of the present invention is applicable to the speech encoding device of the present embodiment, and it is needless to say that it is undoubted.

[First Modification of Sound Decoding Device According to Fifth Embodiment]

Fig. 39 is a view showing the configuration of a first modification 14A of the speech decoding device according to the fifth embodiment.

Fig. 40 is a flowchart showing the operation of the first modification 14A of the speech decoding device according to the fifth embodiment.

The high-frequency time envelope shape determining unit 14b is a plurality of sub-bands of the high-frequency time envelope shape information from the code sequence analyzing unit 13c, the low-frequency signal from the core decoding unit 10b, and the low-frequency signal from the analysis filter group unit 10c. At least one of the signal and the plurality of sub-band signals of the high-frequency signal from the high-frequency signal generating unit 10g is received, and the time envelope shape of the high-frequency signal is determined (step S14-2). For example, the time envelope shape of the high frequency signal is determined to be flat. Even for example, the time envelope shape of the high frequency signal is determined to rise. Even for example, the time envelope shape of the high frequency signal is determined to be down. The difference between the high-frequency envelope shape determining unit 13aC of the third modified example 13C of the audio decoding device according to the fourth embodiment of the present invention is a complex sub-band signal of the high-frequency signal from the high-frequency signal generating unit 10g. It is also allowed to be input. It is also possible to determine the high-frequency time envelope shape by the same method as the sub-band signal of the low-frequency signal according to the sub-band signal of the high-frequency signal.

[Sixth embodiment]

Fig. 41 is a view showing the configuration of the sound decoding device 15 according to the sixth embodiment. The communication device of the audio decoding device 15 receives the multiplexed code sequence output from the lower voice encoding device 25, and outputs the decoded audio signal to the outside. As shown in FIG. 41, the audio decoding device 15 is provided with a coding sequence inverse multiplexing unit 10aA, a core decoding unit 10b, an analysis filter group unit 10c, a code sequence analysis unit 13c, and a high frequency signal generation unit. 10g, decoding/inverse quantization unit 10h, frequency envelope adjustment unit 10i, high-frequency time envelope shape determination unit 13a, time envelope correction unit 15a, and synthesis filter group unit 10j.

Fig. 42 is a flowchart showing the operation of the speech decoding device 15 according to the sixth embodiment.

The time envelope correcting unit 15a corrects the shape of the time envelope of the complex sub-band signal of the high-frequency signal output from the frequency envelope adjusting unit 10i based on the time envelope shape determined by the high-frequency time envelope shape determining unit 13a (step S15-1).

For example, in any period of time t _E (l) ≦ i < t _E (l + 1), it is divided into B _HI (m) (m = 0, ..., M _HI , M _HI ≧ 1) (B _HI (0) ≧k _x , B _HI (M _HI )<k _h ) represents the M _HI frequency bands of the boundary, and the sub-band signal X of the high-frequency signal output from the frequency envelope adjusting unit 10i included in the m-th frequency band _{Adj, HI} (k, i) (B _{adj, HI} (m) ≦ k < B _{adj, HI} (m+1), t _E (l) ≦ i < t _E (l +1)), using the specified function F(X _adj,HI (k,i)), and by the following formula (37) The obtained X' _{adj, HI} (k, i) is output as a sub-band signal of the high-frequency signal whose time envelope shape has been corrected.

For example, when the time envelope shape of the high-frequency signal is determined to be flat, the time envelope shape of the high-frequency signal can be corrected by the following processing. For example, in the process of correcting the time envelope shape to be flat in the time envelope correcting unit 14a, instead of using the sub-band signal of the high-frequency signal output from the high-frequency signal generating unit 10g, the frequency envelope adjusting unit 10i is used instead. The sub-band signal X _{adj, HI} (k, i) of the output high-frequency signal, whereby the time envelope of the sub-band signal X _{adj, HI} (k, i) of the high-frequency signal output from the frequency envelope adjusting unit 10i can be obtained. The shape is corrected to be flat. The time envelope correcting unit 15a performs a process of correcting the shape of the time envelope of the complex sub-band signal of the high-frequency signal to be flat, and is not limited to the above example.

Even, for example, when the time envelope shape of the high-frequency signal is determined to be raised, the time envelope shape of the high-frequency signal can be corrected by the following processing. For example, in the process of correcting the time envelope shape to be raised in the time envelope correcting unit 14a, instead of using the sub-band signal of the high-frequency signal output from the high-frequency signal generating unit 10g, the frequency envelope adjusting unit 10i is used instead. The sub-band signal X _{adj, HI} (k, i) of the output high-frequency signal, whereby the time envelope of the sub-band signal X _{adj, HI} (k, i) of the high-frequency signal output from the frequency envelope adjusting unit 10i can be obtained. The shape is corrected to rise. The time envelope correcting unit 15a performs a process of correcting the shape of the time envelope of the complex sub-band signal of the high-frequency signal to be raised, and is not limited to the above example.

Even, for example, when the time envelope shape of the high-frequency signal is determined to be set down, the time envelope shape of the high-frequency signal can be corrected by the following processing. For example, in the process of correcting the time envelope shape to fall in the time envelope correcting unit 14a, instead of using the sub-band signal of the high-frequency signal output from the high-frequency signal generating unit 10g, the frequency envelope adjusting unit 10i is used instead. The sub-band signal X _{adj, HI} (k, i) of the output high-frequency signal, whereby the time envelope of the sub-band signal X _{adj, HI} (k, i) of the high-frequency signal output from the frequency envelope adjusting unit 10i can be obtained. The shape is corrected to fall. The time envelope correcting unit 15a performs a process of correcting the shape of the time envelope of the complex sub-band signal of the high-frequency signal to fall, and is not limited to the above example.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 15 according to the present embodiment, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. The first modification of the sound decoding device according to the fifth embodiment of the present invention is unquestionable.

Fig. 43 is a view showing the configuration of the speech encoding device 25 according to the sixth embodiment. The communication device of the speech encoding device 25 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 43, the voice encoding device 25 is functionally provided with a down-sampling unit 20a, a core encoding unit 20b, an analysis filter group unit 20c, a control parameter encoding unit 20d, and a package. The network calculation unit 20e, the quantization/encoding unit 20f, the pseudo-frequency signal generation unit 24a, the sub-band signal power calculation unit 24b, the frequency envelope adjustment unit 25a, the time envelope information coding unit 25b, and the code sequence multiplex unit 20h.

Fig. 44 is a flow chart showing the operation of the speech encoding device 25 according to the sixth embodiment.

The frequency envelope adjustment unit 25a is based on the control parameters necessary for the frequency envelope adjustment of the high-frequency signal obtained by the control parameter encoding unit 20d, and the gain and miscellaneous of the high-frequency signal quantized by the quantized/encoded unit 20f. The size of the signal is used to adjust the frequency envelope of the pseudo-high frequency signal generated by the pseudo-frequency signal generating unit 24a (step S25-1). The frequency envelope adjustment processing of the pseudo-frequency signal is performed in the same manner as the processing in the frequency envelope adjusting unit 10i, but the high-frequency signal generated by the high-frequency signal generating unit 10g is paired with the frequency envelope adjusting unit 10i. The sub-band signal of the signal is performed, and the frequency envelope adjusting unit 25a performs the sub-band signal of the pseudo-high-frequency signal generated by the pseudo-frequency signal generating unit 24a. Further, in the frequency envelope adjusting unit 25a, for the purpose of reducing the amount of calculation, part of the processing in the frequency envelope adjusting unit 10i can be omitted. For example, the additional processing of the sine wave signal can be omitted. Even, for example, additional processing of the noise signal can be omitted. At this time, the adjustment processing of the noise signal size can also be omitted.

The time envelope information encoding unit 25b calculates the time envelope of the high frequency signal using the power of the subband signal of the high frequency signal calculated by the envelope calculation unit 20e, and uses the frequency envelope adjustment calculated by the subband signal power calculation unit 24b. The power of the sub-band signal of the pseudo-high frequency signal The rate is used to calculate the time envelope of the pseudo-high frequency signal, and the time envelope information is encoded by the time envelope of the high frequency signal and the temporal envelope of the pseudo high frequency signal (step S25-2). In the processing, if the power of the sub-band signal of the high-frequency signal is not calculated, the power of the sub-band signal of the high-frequency signal can be calculated in the time envelope information encoding unit 25b, and the power of the sub-band signal of the high-frequency signal is Calculated, there is no limit.

For example, by performing the same processing as the processing of the time envelope of the high-frequency signal before the time envelope information encoding unit 21a, the time envelope of the high-frequency signal can be calculated. The time envelope of the sub-band signal of the high-frequency signal is not limited to the pre-recorded example as long as it is a parameter that knows the change in the time direction of the size of the sub-band signal of the high-frequency signal.

For example, in any period of time t _E (l) ≦ i < t _E (l + 1), it is divided into B _{sim, adj, HI} (m) (m = 0, ..., M _{sim, adj, HI} , M _{sim, adj, HI} ≧ 1) (B _{sim, adj, HI} (0) ≧ k _x , B _{sim, adj, HI} (M _{sim, adj, HI} ) < k _h ) represents the M _{sim, adj, HI of the} boundary The frequency band, the sub-band of the pseudo-high frequency signal contained in the mth frequency band X _{sim, adj, HI} (k, i) (B _{sim, adj, HI} (m) ≦ k < B _{sim, adj, HI} ( m+1), t _E (l) ≦i < t _E (l+1)) The time envelope E _{sim, adj, HI} (k, i), is calculated.

The time envelope of the sub-band signal which is similar to the high-frequency signal is not limited to the pre-recorded example as long as it is a parameter that knows the variation of the time direction of the size of the sub-band signal which is intended to be a high-frequency signal.

For example, in the process of calculating the information indicating the flatness of the time envelope information, the time envelope information encoding unit 20g replaces the time envelope of the sub-band signal of the high-frequency signal instead of the time envelope of the sub-band signal of the low-frequency signal, and then replaces the pre-record The time envelope of the sub-band signal of the core decoded signal is changed to the time envelope of the sub-band signal which is like the high-frequency signal, whereby the information indicating the flatness can be calculated as the time envelope information, and the time envelope information can be encoded. For example, if the flatness of the time envelope is to be flattened, it can be encoded by 1 bit. For example, in the pre-recorded arbitrary time zone, the information can be recorded for each of the pre-recorded M _{sim, adj, and HI} bands. Encoded with M _{sim, adj, HI} bits.

In addition, for example, the time envelope information encoding unit 20g calculates the time envelope of the sub-band signal of the high-frequency signal instead of the time envelope of the sub-band signal of the low-frequency signal, and then replaces the time envelope of the sub-band signal of the high-frequency signal. Instead of replacing the time envelope of the sub-band signal of the pre-core decoding signal, the time envelope of the sub-band signal that is like the high-frequency signal is used, thereby calculating the information indicating the degree of rising as the time envelope information, and encoding the time envelope information. . For example, if the time envelope is to be raised by whether it is up, it can be encoded by 1 bit. For example, in the pre-recorded arbitrary time zone, the information can be recorded for each of the pre-recorded M _{sim, adj, and HI} bands. Encoded with M _{sim, adj, HI} bits.

Even, for example, the time envelope information encoding unit 20g calculates the time envelope of the sub-band signal of the high-frequency signal instead of the time envelope of the sub-band signal of the low-frequency signal, and then replaces the time envelope of the sub-band signal of the high-frequency signal. Instead of replacing the time envelope of the sub-band signal of the pre-core decoding signal, the time envelope of the sub-band signal that is like the high-frequency signal is used, thereby calculating the information indicating the degree of the fall as the time envelope information, and encoding the time envelope information. . For example, if you want to show whether the time envelope is down or down, you can use 1 bit to encode. For example, you can use the information in the pre-recorded M _{sim, adj, and HI} bands in any of the preceding time segments. Encoded with M _{sim, adj, HI} bits.

Further, the method of calculating the time envelope information and the encoding method are not limited to the foregoing examples. Further, the first modification of the speech encoding device according to the fourth embodiment of the present invention is applicable to the speech encoding device of the present embodiment, and it is needless to say that it is undoubted.

[First Modification of Sound Decoding Device According to Sixth Embodiment]

Fig. 45 is a view showing the configuration of a first modification 15A of the speech decoding device according to the sixth embodiment.

Fig. 46 is a flowchart showing the operation of the first modification 15A of the speech decoding device according to the sixth embodiment.

In the present modification, the frequency envelope adjusting unit 10i separates and outputs at least one or more components constituting the high-frequency signal. For example, the component constituting the high frequency signal is a high frequency signal component, a noise signal component, and a sine wave signal component generated by the low frequency signal.

The time envelope correcting unit 15aA corrects the slave frequency based on the time envelope shape determined by the high-frequency time envelope shape determining unit 13a. The envelope adjustment unit 10i forms a time envelope shape of at least one of the components constituting the high-frequency signal outputted in a separated form, and synthesizes the high-frequency signal from each component of the high-frequency signal including the component whose time envelope shape has been corrected. Signal (step S15-1a).

For example, the sub-band signal X _{shp, dj, HI} (k, i) (B _{shp, adj, HI} (m)) of the signal of any component of the high-frequency signal outputted in the form of separation from the frequency envelope adjusting section 10i. ≦k<B _shp,adj,HI (m+1),t _E (l)≦i<t _E (l+1)), using the specified function F(X _shp,adj,HI (k,i)) And by the following formula (39) The time envelope shape of the sub-band signal X _{shp, dj, HI} (k, i) of the signal of the arbitrary component of the high-frequency signal is the sub-band signal of the corrected component X' _{shp, adj, HI} (k, i) . Then, the high frequency signal is synthesized and the high frequency signal is output by the subband signal of the component whose time envelope shape has been corrected and the signal of the other component for correcting the shape of the time envelope.

In addition, when there are a plurality of components whose time envelope shape has been corrected, each of them may be corrected to a different time envelope shape. Even the signal of the component whose time envelope shape has been corrected may be the sum signal of the signal of the plurality of components, for example, the sum of the high frequency signal component and the noise signal component generated by the low frequency signal.

In addition, the first, second, and third modifications of the audio decoding device according to the fourth embodiment of the present invention are applicable to the high-frequency time envelope shape determining unit 13a of the audio decoding device 15A according to the present modification. The first modification of the speech decoding device according to the fifth embodiment of the present invention is unquestionable.

[Seventh embodiment]

Fig. 47 is a view showing the configuration of the sound decoding device 16 according to the seventh embodiment. The communication device of the audio decoding device 16 receives the multiplexed code sequence output from the lower voice encoding device 26, and outputs the decoded audio signal to the outside. As shown in FIG. 47, the audio decoding device 16 is functionally provided with a coded sequence inverse multiplexing unit 10a, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analyzing unit 13c, and a low-frequency time envelope shape determination. Part 10e, low-frequency time envelope correction unit 10f, high-frequency time envelope shape determination unit 13a, time envelope correction unit 13b, high-frequency signal generation unit 10g, decoding/inverse quantization unit 10h, frequency envelope adjustment unit 10i, and synthesis filter bank Department 10j.

Fig. 48 is a flow chart showing the operation of the speech decoding apparatus according to the seventh embodiment.

In addition, the first, second, and third modifications of the audio decoding device according to the first embodiment of the present invention are applicable to the low-frequency time envelope shape determining unit 10e of the audio decoding device 16 according to the present embodiment. No doubt.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 16 according to the present embodiment, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. There is no doubt that.

Fig. 49 is a view showing the configuration of the speech encoding device 26 according to the seventh embodiment. The communication device of the audio encoding device 26 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 49, the voice encoding device 26 is functionally provided with a down-sampling unit 20a, a core encoding unit 20b, analysis filter group units 20c and 20c1, a control parameter encoding unit 20d, and an envelope calculation unit 20e. The quantization/encoding unit 20f, the core decoding signal generating unit 20i, the sub-band signal power calculating unit 20j, the time envelope information encoding unit 26a, and the code sequence multiplexing unit 20h.

Fig. 50 is a flowchart showing the operation of the speech encoding device 26 according to the seventh embodiment.

The time envelope information encoding unit 26a calculates at least one of a time envelope of the low frequency signal and a time envelope of the high frequency signal, and then uses the power of the subband signal of the core decoded signal calculated by the pre-subband signal power calculation unit 20j. And calculating a time envelope of the core decoding signal, and encoding the time envelope information according to the time envelope of the time envelope of the low frequency signal and the time envelope of the high frequency signal and the time envelope of the core decoding signal (step S26-1) ).

The time envelope information contains low frequency time envelope information and high frequency time envelope information.

The time envelope of the low frequency signal is the time envelope of the low frequency signal calculated using the power of the subband signal of the low frequency signal calculated by the envelope calculation unit 20e. The time envelope of the high frequency signal is the power of the subband signal of the high frequency signal calculated by the envelope calculation unit 20e. Calculate the time envelope of the high frequency signal. In the processing, if the power of the sub-band signal of the low-frequency signal is not calculated, the power of the sub-band signal of the low-frequency signal can be calculated by the time envelope information encoding unit 26a, and the power of the sub-band signal of the low-frequency signal is calculated, and No limit. Even if the power of the sub-band signal of the high-frequency signal is not calculated, the power of the sub-band signal of the high-frequency signal can be calculated by the time envelope information encoding unit 26a, and the power of the sub-band signal of the high-frequency signal is calculated, and No limit.

For example, the low-frequency time envelope information can be calculated and encoded in the same manner as the operation of the time envelope information encoding unit 20g, and the high-frequency time envelope information can be calculated and encoded in the same manner as the operation of the time envelope information encoding unit 23a. The calculation and encoding of the low-frequency time envelope information and the high-frequency time envelope information are not limited to the foregoing examples.

The low frequency time envelope information and the high frequency time envelope information may also be individually encoded or may be encoded together. In the present invention, there is no encoding method for defining low frequency time envelope information and high frequency time envelope information.

For example, the low frequency time envelope information and the high frequency time envelope information are treated as vectors, which can be encoded by vector quantization. Even, for example, the vector can be entropy encoded.

In addition, the low-frequency time envelope information and the high-frequency time envelope information can be set to the same time envelope information. In this case, the code sequence analysis unit 10d of the sound decoding device 16 outputs the same time envelope information as the low-frequency time envelope information and high. Frequency time envelope information. In the present invention, the form of the low frequency time envelope information and the high frequency time envelope information are not There are limits.

[First Modification of Sound Decoding Device According to Seventh Embodiment]

Fig. 51 is a diagram showing the configuration of a first modification 16A of the speech decoding device according to the seventh embodiment.

Fig. 52 is a flowchart showing the operation of the first modification 16A of the speech decoding device according to the seventh embodiment.

The high-frequency time envelope shape determining unit 16a is a plurality of sub-bands of the high-frequency time envelope shape information from the code sequence analyzing unit 13c, the low-frequency signal from the core decoding unit 10b, and the low-frequency signal from the analysis filter group unit 10c. The signal, at least one of the complex sub-band signals of the low-frequency signal from the time envelope shape of the low-frequency time envelope correction unit 10f is received, and the time envelope shape of the high-frequency signal is determined (step S16-1). For example, a case in which the time envelope shape of the high-frequency signal is determined to be flat, a case in which the time envelope shape of the high-frequency signal is determined to be raised, and a case in which the time envelope shape of the high-frequency signal is determined to fall are cited. The difference between the high-frequency envelope shape determining unit 13aC of the third modified example 13C of the audio decoding device according to the fourth embodiment is the plural of the low-frequency signal whose time envelope shape has been corrected from the low-frequency time envelope correcting unit 10f. The sub-band signal is also allowed to be input, and the high-frequency time envelope shape can also be determined by the same method as the sub-band signal of the low-frequency signal from the analysis filter group unit 10c based on the sub-band signal of the low-frequency signal.

[Second Modification of Sound Decoding Device According to Seventh Embodiment]

Fig. 153 is a diagram showing the configuration of a second modification 16B of the speech decoding device according to the seventh embodiment.

Fig. 154 is a flowchart showing the operation of the second modification 16B of the speech decoding device according to the seventh embodiment.

In the present modification, the difference between the low-frequency time envelope shape determining unit 16b and the pre-recorded low-frequency envelope shape determining unit 10eC is also notified to the time envelope correcting unit 16c by the determined low-frequency envelope shape. The determination of the temporal envelope shape in the low-frequency time envelope shape determining unit 16b may be based on, for example, a frequency power distribution based on the pre-recorded low-frequency signal.

Even the same deformation can be applied to the pre-recorded low-frequency envelope shape determining sections 10e, 10eA, and 10eB, and there is no doubt.

The difference between the time envelope correcting unit 16c and the preceding time envelope correcting unit 13b is based on the time envelope shape and the low frequency time envelope received from the high frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, 13aB). At least one of the time envelope shapes received by the shape determining unit 16b, the time of the complex sub-band signal output from the analysis filter group unit 10c and used by the high-frequency signal generating unit 10g for generating the high-frequency signal The shape of the envelope is corrected (S16-2).

For example, when the information of the flat time envelope shape is received from the low-frequency time envelope shape determining unit 16b, the time envelope shape received from the high-frequency envelope shape determining unit 13aC is output from the analysis filter group unit 10c. The shape of the time envelope of the complex sub-band signal Shaped, corrected to flat. For example, when the information of the non-flat time envelope shape is received from the low-frequency time envelope shape determining unit 16b, the analysis filter unit portion is not used regardless of the time envelope shape received by the high-frequency time envelope shape determining unit 13aC. The shape of the time envelope of the complex sub-band signal outputted by 10c is corrected to be flat. The same is true for ascending and falling, and the shape of the time envelope is not limited.

[Third Modification of Sound Decoding Device According to Seventh Embodiment]

Fig. 155 is a diagram showing the configuration of a third modification 16C of the speech decoding device according to the seventh embodiment.

Fig. 156 is a flowchart showing the operation of the third modification 16C of the speech decoding device according to the seventh embodiment.

In the present modification, the difference between the high-frequency time envelope shape determining unit 16d and the pre-recorded high-frequency envelope shape determining unit 13aC is notified to the low-frequency time envelope correcting unit 16e by the determined high-frequency envelope shape.

The determination of the temporal envelope shape in the high-frequency time envelope shape determining unit 16d may be based on, for example, a frequency power distribution based on the pre-recorded low-frequency signal. Even, for example, the frame length at the time of generation of the high frequency signal obtained from the code sequence analyzing unit 13c can be used. For example, it can be determined that the frame length is flat when the frame length is long, and it is up or down when the frame length is short. As an example of the frame length at the time of generation of the high-frequency signal, the "time segment" which determines the boundary by "time border" as defined in "ISO/IEC 14496-3" is mentioned. length. Even the same deformation can be applied to the pre-recorded high-frequency envelope shape determining sections 13a, 13aA, and 13aB, and there is no doubt.

The difference between the low-frequency time envelope correction unit 16e and the pre-recorded low-frequency envelope correction unit 10f is based on the time envelope shape and the high-frequency received from the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB). At least one of the temporal envelope shapes received by the temporal envelope shape determining unit 16d corrects the shape of the time envelope of the complex sub-band signals output from the analysis filter bank unit 10c (S16-3).

For example, when the information of the flat time envelope shape is received from the high-frequency time envelope shape determining unit 16d, the time envelope shape received from the low-frequency time envelope shape determining unit 10eC is output from the analysis filter group unit 10c. The shape of the time envelope of the complex sub-band signal is corrected to be flat. For example, when the information of the non-flat time envelope shape is received from the high-frequency time envelope shape determining unit 16d, the time-inclusive envelope shape is not taken from the analysis filter group portion regardless of the time envelope shape received from the low-frequency time envelope shape determining unit 10eC. The shape of the time envelope of the complex sub-band signal outputted by 10c is corrected to be flat. The same is true for ascending and falling, and the shape of the time envelope is not limited.

[Fourth Modification of Sound Decoding Device According to Seventh Embodiment]

Figure 157 is a diagram showing the configuration of a fourth modification 16D of the speech decoding device according to the seventh embodiment.

Fig. 158 is a flowchart showing the operation of the fourth modification 16D of the speech decoding device according to the seventh embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 16c, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Fifth Modification of Sound Decoding Device According to Seventh Embodiment]

Fig. 159 is a diagram showing the configuration of a fifth modification 16E of the speech decoding device according to the seventh embodiment.

Fig. 160 is a flowchart showing the operation of the fifth modification 16E of the speech decoding device according to the seventh embodiment.

The difference between the present modification and the audio decoding device 16 according to the seventh embodiment is that the low-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a include the time envelope shape determining unit 16f. point.

The time envelope shape determining unit 16f is based on the information about the low-frequency time envelope shape from the encoding sequence inverse multiplexing unit 10a, the low-frequency signal from the core decoding unit 10b, and the complex sub-band of the low-frequency signal from the analysis filter bank unit 10c. The signal and the at least one of the information on the envelope shape of the high frequency time from the code sequence analysis unit 13c determine the time envelope shape (S16-4). The determined time envelope shape is notified to the low frequency time envelope correcting unit 10f and the time envelope correcting unit 13b.

For example, the shape of the time envelope is determined to be flat. Even for example, the shape of the time envelope is determined to rise. Even for example, the shape of the time envelope is determined to fall. The time envelope shape determined is not limited to The above example.

The time envelope shape determining unit 16f can be similar to, for example, the low-frequency time envelope shape determining units 10e, 10eA, 10eB, 10eC, and 16b and the high-frequency time envelope shape determining units 13a, 13aA, 13aB, 13aC, and 16d. Ground, determine the shape of the time envelope. The method of determining the shape of the time envelope is not limited to the above example.

[First Modification of Voice Encoding Device According to Seventh Embodiment]

Fig. 53 is a view showing the configuration of a first modification 26A of the speech encoding device according to the seventh embodiment.

Fig. 54 is a flowchart showing the operation of the first modification 26A of the speech encoding device according to the seventh embodiment.

The time envelope information encoding unit 26aA calculates at least one of a time envelope of the low frequency signal and a time envelope of the high frequency signal, and calculates the time by at least one of the time envelope of the low frequency signal and the high frequency signal. The envelope information is encoded and encoded (step S26-1a).

The time envelope information contains low frequency time envelope information and high frequency time envelope information. Similarly to the operation of the time envelope information encoding unit 26a of the speech encoding device 26 of the seventh embodiment, the encoding method of the low frequency time envelope information and the high frequency time envelope information is not limited.

The time envelope of the low frequency signal is the time envelope of the low frequency signal calculated using the power of the subband signal of the low frequency signal calculated by the envelope calculation unit 20e.

The time envelope of the high frequency signal is the time envelope of the high frequency signal calculated using the power of the subband signal of the high frequency signal calculated by the envelope calculation unit 20e.

In the processing, if the power of the sub-band signal of the low-frequency signal is not calculated, the power of the sub-band signal of the low-frequency signal can be calculated by the time envelope information encoding unit 26aA, and the power of the sub-band signal of the low-frequency signal is calculated. There is no limit.

Even if the power of the sub-band signal of the high-frequency signal is not calculated, the power of the sub-band signal of the high-frequency signal can be calculated by the time envelope information encoding unit 26aA, and the power of the sub-band signal of the high-frequency signal is calculated. There is no limit.

For example, the low-frequency time envelope information can be calculated and encoded in the same manner as the operation of the time envelope information encoding unit 20gA, and the high-frequency time envelope information can be calculated and encoded in the same manner as the operation of the time envelope information encoding unit 23aA. The calculation and encoding of the low-frequency time envelope information and the high-frequency time envelope information are not limited to the foregoing examples.

Even in the same manner as the operation of the time envelope information encoding unit 26a of the speech encoding device 26 of the seventh embodiment, the low-frequency time envelope information and the high-frequency time envelope information can be set to the same time envelope information.

[Eighth Embodiment]

Fig. 55 is a diagram showing the configuration of the audio decoding device 17 according to the eighth embodiment. The communication device of the sound decoding device 17 will record the sound from below The multiplexed code sequence output by the encoding device 27 is received, and then the decoded audio signal is output to the outside. As shown in FIG. 55, the audio decoding device 17 is functionally provided with a code sequence inverse multiplexing unit 10a, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analysis unit 13c, and a low-frequency time envelope shape determination. Part 10e, low-frequency time envelope correction unit 10f, high-frequency signal generation unit 10g, high-frequency time envelope shape determination unit 13a, time envelope correction unit 14a, decoding/inverse quantization unit 10h, frequency envelope adjustment unit 10i, and synthesis filter bank Department 10j.

Fig. 56 is a flow chart showing the operation of the sound decoding device according to the eighth embodiment.

In addition, the first, second, and third modifications of the audio decoding device according to the first embodiment of the present invention are applicable to the low-frequency time envelope shape determining unit 10e of the audio decoding device 17 according to the present embodiment. No doubt.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 17 according to the present embodiment, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. The first modification of the audio decoding device according to the fifth embodiment of the present invention and the first modification of the audio decoding device according to the seventh embodiment of the present invention are unquestionable.

Fig. 57 is a view showing the configuration of the speech encoding device 27 according to the eighth embodiment. The communication device of the speech encoding device 27 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. The sound encoding device 27 is as shown in the figure As shown in FIG. 57, the down-conversion sampling unit 20a, the core encoding unit 20b, the analysis filter group units 20c and 20c1, the control parameter encoding unit 20d, the envelope calculation unit 20e, the quantization/encoding unit 20f, and the pseudo-high are provided. The frequency signal generation unit 24a, the core decoding signal generation unit 20i, the sub-band signal power calculation units 20j and 24b, the time envelope information coding unit 27a, and the code sequence multiplex unit 20h.

Fig. 58 is a flow chart showing the operation of the speech encoding device 27 according to the eighth embodiment.

The time envelope information encoding unit 27a calculates at least one of a time envelope of a low frequency signal input to the audio signal, a time envelope of the high frequency signal, a time envelope of the core decoded signal, and a time envelope of the pseudo high frequency signal. The time envelope information is encoded based on the calculated time envelope (step S27-1).

The time envelope information contains low frequency time envelope information and high frequency time envelope information.

The time envelope of the low frequency signal is the time envelope of the low frequency signal calculated using the power of the subband signal of the low frequency signal calculated by the envelope calculation unit 20e. The time envelope of the high frequency signal is the time envelope of the high frequency signal calculated using the power of the subband signal of the high frequency signal calculated by the envelope calculation unit 20e. In the processing, if the power of the sub-band signal of the low-frequency signal is not calculated, the power of the sub-band signal of the low-frequency signal can be calculated by the time envelope information encoding unit 27a, and the power of the sub-band signal of the low-frequency signal is calculated, and No limit. Even if the power of the sub-band signal of the high-frequency signal is not calculated, it can be used in time. The signal encoding unit 27a calculates the power of the sub-band signal of the high-frequency signal, and the power of the sub-band signal of the high-frequency signal is calculated, and is not limited.

The time envelope of the core decoded signal is calculated using the power of the sub-band signal of the core decoded signal calculated by the pre-subband signal power calculation unit 20j.

The time envelope of the pseudo-high frequency signal is calculated by using the power of the sub-band signal of the pseudo-high frequency signal calculated by the pre-subband frequency signal power calculation unit 24b.

For example, the time envelope information of the low frequency signal can be calculated and encoded in the same manner as the operation of the time envelope information encoding unit 20g, and the time envelope information of the high frequency signal can be calculated and encoded in the same manner as the operation of the time envelope information encoding unit 24c. .

Similarly to the operation of the temporal envelope information encoding unit 26a of the speech encoding device 26 of the seventh embodiment, the method of calculating and encoding the low-frequency time envelope information and the high-frequency time envelope information is not limited.

Even in the same manner as the time envelope information encoding unit 26a of the voice encoding device 26 of the seventh embodiment, the low-frequency time envelope information and the high-frequency time envelope information can be set to the same time envelope information.

Further, the first modification of the speech encoding device according to the seventh embodiment of the present invention is applicable to the speech encoding device 27 according to the present embodiment, and it is needless to say that it is undoubted.

[First Modification of Sound Decoding Device According to Eighth Embodiment]

Figure 161 is a first variation of the sound decoding device according to the eighth embodiment. An illustration of the configuration of the shape 17A.

Fig. 162 is a flowchart showing the operation of the first modification 17A of the speech decoding device according to the eighth embodiment.

In the present modification, the difference between the time envelope correcting unit 17a and the preceding time envelope correcting unit 14a is based on the time envelope received from the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, 13aB). At least one of the shape and the time envelope shape received from the low-frequency time envelope shape determining unit 16b corrects the shape of the time envelope of the complex sub-band signal of the high-frequency signal output from the high-frequency signal generating unit 10g ( S17-1).

For example, when the information of the flat time envelope shape is received from the low-frequency time envelope shape determining unit 16b, the time envelope shape received from the high-frequency envelope shape determining unit 13aC is output from the high-frequency signal generating unit 10g. The shape of the time envelope of the complex sub-band signal is corrected to be flat. For example, when the information of the non-flat time envelope shape is received from the low-frequency time envelope shape determining unit 16b, the high-frequency signal generating unit is not used regardless of the time envelope shape received by the high-frequency time envelope shape determining unit 13aC. The shape of the time envelope of the complex sub-band signal outputted by 10g is corrected to be flat. The same is true for ascending and falling, and the shape of the time envelope is not limited.

[Second Modification of Sound Decoding Device According to Eighth Embodiment]

Fig. 163 is a diagram showing the configuration of a second modification 17B of the speech decoding device according to the eighth embodiment.

Fig. 164 is a flowchart showing the operation of the second modification 17B of the speech decoding device according to the eighth embodiment.

The difference between the present modification and the audio decoding device 17 according to the eighth embodiment is that the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) and the low-frequency time envelope correcting unit 10f may be used. Further, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[Third Modification of Sound Decoding Device According to Eighth Embodiment]

Figure 165 is a diagram showing the configuration of a third modification 17C of the speech decoding device according to the eighth embodiment.

Fig. 166 is a flowchart showing the operation of the third modification 17C of the speech decoding device according to the eighth embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 17a, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Fourth Modification of the Sound Decoding Device of the Eighth Embodiment]

Figure 167 is a diagram showing the configuration of a fourth modification 17D of the speech decoding device according to the eighth embodiment.

Fig. 168 is a flowchart showing the operation of the fourth modification 17D of the speech decoding device according to the eighth embodiment.

The present modification and the sound solution described in the eighth embodiment The difference between the code device 17 and the high-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a further includes a time envelope shape determining unit 16f.

[Ninth Embodiment]

Fig. 59 is a view showing the configuration of the sound decoding device 18 according to the ninth embodiment. The communication device of the audio decoding device 18 receives the multiplexed code sequence output from the lower voice encoding device 28, and outputs the decoded audio signal to the outside. As shown in FIG. 59, the audio decoding device 18 is functionally provided with an encoding sequence inverse multiplexing unit 10a, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analyzing unit 13c, and a low-frequency time envelope shape determination. Part 10e, low-frequency time envelope correction unit 10f, high-frequency signal generation unit 10g, decoding/inverse quantization unit 10h, frequency envelope adjustment unit 10i, high-frequency time envelope shape determination unit 13a, time envelope correction unit 14a, and synthesis filter bank Department 10j.

Figure 60 is a flowchart showing the operation of the sound decoding device according to the ninth embodiment.

In addition, the first, second, and third modifications of the audio decoding device according to the first embodiment of the present invention are applicable to the low-frequency time envelope shape determining unit 10e of the audio decoding device 18 according to the present embodiment. No doubt.

In addition, the first, second, and third modifications of the audio decoding device according to the fourth embodiment of the present invention can be applied to the high-frequency time envelope shape determining unit 13a of the audio decoding device 18 according to the present embodiment, and The first modification of the speech decoding device according to the fifth embodiment of the present invention and the first modification of the speech decoding device according to the seventh embodiment of the present invention are unquestionable.

Fig. 61 is a view showing the configuration of the speech encoding device 28 according to the ninth embodiment. The communication device of the audio encoding device 28 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 61, the voice encoding device 28 is functionally provided with a down-sampling unit 20a, a core encoding unit 20b, analysis filter group units 20c and 20c1, a control parameter encoding unit 20d, and an envelope calculation unit 20e. The quantization/encoding unit 20f, the pseudo-high-frequency signal generating unit 24a, the frequency envelope adjusting unit 25a, the core decoding signal generating unit 20i, the sub-band signal power calculating units 20j and 24b, the time envelope information encoding unit 27a, and the coding sequence multiplexing Department 20h.

Fig. 62 is a flow chart showing the operation of the speech encoding device 28 according to the ninth embodiment.

The time envelope information encoding unit 28a is at least one of a time envelope of a low frequency signal input to the audio signal, a time envelope of the high frequency signal, a time envelope of the core decoded signal, and a time envelope of the pseudo frequency modulated signal adjusted by the frequency envelope. The above calculation is performed, and the time envelope information is encoded based on the calculated time envelope (step S28-1).

The time envelope information contains low frequency time envelope information and high frequency time envelope information. Similarly to the operation of the time envelope information encoding unit 26a of the speech encoding device 26 of the seventh embodiment, the encoding method of the low frequency time envelope information and the high frequency time envelope information is not limited. set.

The time envelope of the low frequency signal is the time envelope of the low frequency signal calculated using the power of the subband signal of the low frequency signal calculated by the envelope calculation unit 20e. The time envelope of the high frequency signal is the time envelope of the high frequency signal calculated using the power of the subband signal of the high frequency signal calculated by the envelope calculation unit 20e. In the processing, if the power of the sub-band signal of the low-frequency signal is not calculated, the power of the sub-band signal of the low-frequency signal can be calculated by the time envelope information encoding unit 28a, and the power of the sub-band signal of the low-frequency signal is calculated, and No limit. Even if the power of the sub-band signal of the high-frequency signal is not calculated, the power of the sub-band signal of the high-frequency signal can be calculated by the time envelope information encoding unit 28a, and the power of the sub-band signal of the high-frequency signal is calculated, and No limit.

The time envelope of the core decoded signal is calculated using the power of the subband signal of the core decoded signal calculated by the subband signal power calculation unit 20j.

The time envelope of the pseudo-high frequency signal subjected to the frequency envelope adjustment is calculated by using the power of the sub-band signal of the pseudo-high frequency signal calculated by the sub-band signal power calculation unit 24b.

For example, the time envelope information of the low frequency signal can be calculated and encoded in the same manner as the operation of the time envelope information encoding unit 20g, and the time envelope information of the high frequency signal can be calculated and encoded in the same manner as the operation of the time envelope information encoding unit 25b. .

The low frequency time envelope information is the same as the operation of the time envelope information encoding unit 26a of the speech encoding device 26 of the seventh embodiment. The method of calculating and encoding the high-frequency time envelope information is not limited.

Even in the same manner as the time envelope information encoding unit 26a of the voice encoding device 26 of the seventh embodiment, the low-frequency time envelope information and the high-frequency time envelope information can be set to the same time envelope information.

Further, the first modification of the speech encoding device according to the seventh embodiment of the present invention is applicable to the speech encoding device 28 according to the present embodiment, and it is needless to say that it is undoubted.

[First Modification of Sound Decoding Device According to Ninth Embodiment]

Fig. 63 is a view showing the configuration of a first modification 18A of the speech decoding device according to the ninth embodiment.

Fig. 64 is a flowchart showing the operation of the first modification 18A of the sound-decoding apparatus according to the ninth embodiment.

In the low-frequency envelope shape determining unit 10e of the audio decoding device 18A according to the present modification, the first, second, and third modified examples of the audio decoding device according to the first embodiment of the present invention can be applied. No doubt.

Further, the high-frequency time envelope shape determining unit 13a of the audio decoding device 18A according to the present modification can be applied to the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention, and the present invention. The first modification of the audio decoding device according to the fifth embodiment of the present invention and the first modification of the audio decoding device according to the seventh embodiment of the present invention are unquestionable.

[Second Modification of Sound Decoding Device According to Ninth Embodiment]

Figure 169 is a diagram showing the configuration of a second modification 18B of the speech decoding device according to the ninth embodiment.

Fig. 170 is a flowchart showing the operation of the second modification 18B of the speech decoding device according to the ninth embodiment.

In the present modification, the difference between the temporal envelope correcting unit 18a and the pre-recording time envelope correcting unit 15a is based on the time envelope received from the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, 13aB). At least one of the shape and the time envelope shape received from the low-frequency time envelope shape determining unit 16b corrects the shape of the time envelope of the complex sub-band signal of the high-frequency signal output from the frequency envelope adjusting unit 10i (S18) -1).

For example, when the information of the flat time envelope shape is received from the low-frequency time envelope shape determining unit 16b, the time envelope shape obtained by the high-frequency envelope shape determining unit 13aC is output from the frequency envelope adjusting unit 10i. The shape of the time envelope of the complex sub-band signal is corrected to be flat. For example, when the information of the non-flat time envelope shape is received from the low-frequency time envelope shape determining unit 16b, the frequency envelope adjustment unit 10i is not used regardless of the time envelope shape received by the high-frequency time envelope shape determining unit 13aC. The shape of the time envelope of the output complex sub-band signal is corrected to be flat. The same is true for ascending and falling, and the shape of the time envelope is not limited.

[Third Modification of Sound Decoding Device According to Ninth Embodiment]

Figure 171 is a diagram showing the configuration of a third modification 18C of the speech decoding device according to the ninth embodiment.

Figure 172 is a flowchart showing the operation of the third modification 18C of the speech decoding device according to the ninth embodiment.

The difference between the present modification and the audio decoding device 18 according to the ninth embodiment is that the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) and the low-frequency time envelope correcting unit 10f may be used. Further, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[Fourth Modification of the Sound Decoding Device of the Ninth Embodiment]

Figure 173 is a diagram showing the configuration of a fourth modification 18D of the speech decoding device according to the ninth embodiment.

Figure 174 is a flowchart showing the operation of the fourth modification 18D of the speech decoding device according to the ninth embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 18a, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Fifth Modification of Sound Decoding Device According to Ninth Embodiment]

Figure 175 is a diagram showing the configuration of a fifth modification 18E of the speech decoding device according to the ninth embodiment.

Figure 176 is a sound decoding device according to a ninth embodiment. A flowchart of the operation of the fifth modification 18E.

The difference between the present modification and the audio decoding device 18 according to the ninth embodiment is that the low-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a include the time envelope shape determining unit 16f. point.

[Sixth Modification of Sound Decoding Device According to Ninth Embodiment]

Figure 177 is a diagram showing the configuration of a sixth modification 18F of the speech decoding device according to the ninth embodiment.

Figure 178 is a flowchart showing the operation of the sixth modification 18F of the speech decoding device according to the ninth embodiment.

In the present modification, the difference between the time envelope correcting unit 18aA and the preceding time envelope correcting unit 15aA is based on the time envelope received from the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, 13aB). At least one of the shape and the time envelope shape received from the low-frequency time envelope shape determining unit 16b corrects at least one of the components constituting the high-frequency signal outputted from the frequency envelope adjusting unit 10i in a separated form. The time envelope shape synthesizes a high frequency signal from each component of the high frequency signal including the component whose time envelope shape has been corrected, and outputs this point (S18-1a).

For example, when the information of the flat time envelope shape is received from the low-frequency time envelope shape determining unit 16b, the frequency envelope adjusting unit 10i is separated from the frequency envelope shape determining unit 13aC regardless of the time envelope shape received by the high-frequency time envelope shape determining unit 13aC. Formed and outputted to form a high frequency signal At least one of the components has a time envelope shape corrected to be flat. For example, when the information of the non-flat time envelope shape is received from the low-frequency time envelope shape determining unit 16b, the frequency envelope adjustment unit 10i is not used regardless of the time envelope shape received by the high-frequency time envelope shape determining unit 13aC. At least one of the time envelope shapes of the components constituting the high frequency signal outputted in the form of separation is corrected to be flat. The same is true for ascending and falling, and the shape of the time envelope is not limited.

[Seventh Modification of Sound Decoding Device According to Ninth Embodiment]

Figure 179 is a diagram showing the configuration of a seventh modification 18G of the speech decoding device according to the ninth embodiment.

Fig. 180 is a flowchart showing the operation of the seventh modification 18G of the speech decoding device according to the ninth embodiment.

The difference between the present modification and the audio decoding device 18A according to the first modification of the ninth embodiment is that the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) may be used. In addition to the envelope correcting unit 10f, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[Eighth Modification of Sound Decoding Device According to Ninth Embodiment]

Fig. 181 is a diagram showing the configuration of an eighth modification 18H of the speech decoding device according to the ninth embodiment.

Fig. 182 is a flowchart showing the operation of the eighth modification 18H of the speech decoding device according to the ninth embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 18aA, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Ninth Modification of Sound Decoding Device According to Ninth Embodiment]

Figure 183 is a diagram showing the configuration of a ninth modification 18I of the speech decoding device according to the ninth embodiment.

Figure 184 is a flowchart showing the operation of the ninth modification 18I of the speech decoding device according to the ninth embodiment.

The difference between the present modification and the audio decoding device 18A according to the first modification of the ninth embodiment is that the low-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a have a time envelope shape. The decision unit 16f does this.

[Tenth embodiment]

Fig. 65 is a view showing the configuration of the sound decoding device 1 according to the tenth embodiment. The communication device of the audio decoding device 1 receives the multiplexed code sequence output from the lower audio coding device 2, and outputs the decoded audio signal to the outside. As shown in FIG. 65, the audio decoding device 1 is functionally provided with a code sequence analysis unit 1a, a voice decoding unit 1b, a time envelope shape determining unit 1c, and a time envelope correcting unit 1d.

Figure 66 is a diagram showing a sound decoding device 1 according to a tenth embodiment. Flow chart of the action.

The code sequence analysis unit 1a analyzes the code sequence and divides it into a voice code portion and information on the time envelope shape (step S1-1).

The audio decoding unit 1b decodes the audio coding portion of the code sequence to obtain a decoded signal (step S1-2).

The temporal envelope shape determining unit 1c determines the temporal envelope shape of the decoded signal based on at least one of the information on the temporal envelope shape and the decoded signal obtained by the audio decoding unit 1b, which is divided by the code sequence analysis unit 1a. (Step S1-3).

For example, the time envelope shape of the decoded signal is determined to be flat. For example, calculating the power of the decoded signal or a parameter similar thereto, and calculating the dispersion of the parameter or a parameter similar thereto. The calculated parameters are compared to a predetermined threshold to determine if the shape of the time envelope is flat or flat. In another example, the ratio of the summed average to the multiplied average of the power of the decoded signal or a parameter similar thereto or a parameter similar thereto is calculated and compared with the predetermined threshold to determine whether the shape of the time envelope is flat or flat. degree. The method of determining the temporal envelope shape of the decoded signal to be flat is not limited to the above example.

Even for example, the time envelope shape of the decoded signal is determined to rise. For example, the power of the decoded signal or a parameter similar thereto is calculated, the difference value of the time direction of the parameter is calculated, and the maximum value of the difference value in an arbitrary time zone is calculated. The maximum value is compared with the predetermined threshold to determine whether the shape of the time envelope is raised or raised. Decoding signal The time envelope shape is determined to be a rising method, and is not limited to the above example.

Even, for example, the time envelope shape of the low frequency signal is determined to be down. For example, the power of the decoded signal or a parameter similar thereto is calculated, the difference value of the time direction of the parameter is calculated, and the minimum value of the difference value in an arbitrary time zone is calculated. The minimum value is compared to the predetermined threshold to determine whether the shape of the time envelope is down or down. The method of determining the time envelope shape of the decoded signal as a fall is not limited to the above example.

The above example is applicable even when the decoded signal is outputted from the sound decoding unit 1b as a signal in the time domain, and the decoded signal is output as a complex sub-band signal.

The time envelope correction unit 1d corrects the shape of the time envelope of the decoded signal output from the audio decoding unit 1b based on the time envelope shape determined by the time envelope shape determining unit 1c (step S1-4).

For example, when the current decoded signal is represented by a complex sub-band signal, the time envelope correction unit 1d is a complex sub-band signal X _dec (k, i) for the pre-decoded signal in an arbitrary time zone (0≦k<k) _h , t(l)≦i<t(l+1)), using the predetermined function F(X _dec (k,i)) by the following formula (40) The obtained X' _dec (k, i) is calculated as a sub-band signal of the decoded signal whose time envelope shape has been corrected, and the signal of the time domain is synthesized and output by the sub-band signal.

For example, when the time envelope shape of the pre-decoded signal is determined to be flat, the time envelope shape of the decoded signal can be corrected by the following processing. For example, the subband signal X _dec (k, i) is divided into B _dec (m) (m = 0, ..., M _dec , M _dec ≧ 1) (B _dec (0) ≧ 0, B _dec (M _Dec )<k _h ) denotes the M _dec bands of the boundary, for the sub-band signal X _dec (k,i) contained in the m-th band (B _dec (m)≦k<B _dec (m+1),t (l) ≦i<t(l+1)), set the specified function F(X _dec (k,i)) to or, X' _dec (k, i) is calculated as a sub-band signal of the decoded signal whose time envelope shape has been corrected.

Further, according to another example, the predetermined function F(X _dec (k, i)) is subjected to smoothing filter processing for the sub-band signal X _dec (k, i).

The definition is (N _filt ≧ 1), and X' _dec (k, i) is calculated as a sub-band signal of the decoded signal whose time envelope shape has been corrected. Then, in each frequency band in which the B _dec (m) is used before the use, the processing of the power of the sub-band signals before and after the filter processing can be made uniform.

According to another example, the sub-band signal X _dec (k, i) is linearly predicted in the frequency direction in each frequency band indicating the boundary before the use of B _dec (m) to obtain a linear prediction coefficient α _p (m). (m=0,...,M _dec -1), the predetermined function F(X _dec (k, i)) is subjected to linear prediction inverse filter processing on the sub-band signal X _dec (k, i).

The definition is (N _pred ≧1), and X' _dec (k, i) is calculated as a sub-band signal of the decoded signal whose time envelope shape has been corrected.

An example in which the above-described time envelope shape is corrected to be flat can be implemented by combining the respective ones.

The time envelope correction unit 1d performs a process of correcting the shape of the time envelope of the decoded signal to be flat, and is not limited to the above example.

Even, for example, when the time envelope shape of the pre-decoded signal is determined to be up, the time envelope shape of the decoded signal can be corrected by the following processing.

For example, the defined function F(X _dec (k,i)) is defined as a monotonically increasing function incr(i) for i. And X' _dec (k, i) is calculated as a sub-band signal of the decoded signal whose time envelope shape has been corrected. Then, in each frequency band in which the B _dec (m) is used before the use, the processing of the power of the sub-band signals before and after the correction of the time envelope shape can be performed.

The time envelope correction unit 1d performs a process of correcting the shape of the time envelope of the complex sub-band signal of the decoded signal to be raised, and is not limited to the above example.

Even, for example, when the time envelope shape of the pre-decoded signal is determined to be down, the time envelope shape of the decoded signal can be corrected by the following processing.

For example, the defined function F(X _dec (k,i)) is defined as a monotonically decreasing function decr(i) for i. And X' _dec (k, i) is calculated as a sub-band signal of the low-frequency signal whose time envelope shape has been corrected. Then, in each frequency band in which the B _dec (m) is used before the use, the processing of the power of the sub-band signals before and after the correction of the time envelope shape can be performed.

The time envelope correction unit 1d performs a process of correcting the shape of the time envelope of the complex sub-band signal of the decoded signal to fall, and is not limited to the above example.

For example, when the current decoded signal is represented by a signal of a time domain, the time envelope correction unit 1d is a pre-decoded signal x _dec (i) (t(l)≦i<t(l+) in an arbitrary time zone. 1)), using the specified function F _t (x _dec (i)) The obtained x' _dec (i) is output as a decoded signal whose time envelope shape has been corrected.

For example, when the time envelope shape of the pre-decoded signal is determined to be flat, the time envelope shape of the decoded signal can be corrected by the following processing.

For example, for the decoded signal x _dec (i), the predetermined function F _t (x _dec (i)) is set to X' _dec (i) is output as a decoded signal whose time envelope shape has been corrected.

Further, according to another example, the predetermined function F _t (x _dec (i)) is _{subjected to} smoothing filter processing on the decoded signal x _dec (i). Definition (N _filt ≧ 1), and x' _dec (i) is output as a decoded signal whose time envelope shape has been corrected.

An example in which the above-described time envelope shape is corrected to be flat can be implemented by combining the respective ones.

Even, for example, when the time envelope shape of the pre-decoded signal is determined to be up, the time envelope shape of the decoded signal can be corrected by the following processing. For example, the defined function F _t (x _dec (i)) is defined as a monotonically increasing function incr(i) for i. X' _dec (i) is output as a decoded signal whose time envelope shape has been corrected.

The time envelope correction unit 1d performs a process of correcting the shape of the time envelope of the decoded signal to be raised, and is not limited to the above example.

Even, for example, when the time envelope shape of the pre-decoded signal is determined to be down, the time envelope shape of the decoded signal can be corrected by the following processing. For example, the defined function F _t (x _dec (i)) is defined as a monotonically decreasing function decr(i) for i. X' _dec (i) is output as a decoded signal whose time envelope shape has been corrected. The time envelope correction unit 1d performs a process of correcting the shape of the time envelope of the decoded signal to fall, and is not limited to the above example.

For example, when the pre-decoded signal is represented by a discrete Fourier transform, a discrete cosine transform, and a modified discrete cosine transform represented by a frequency domain conversion factor X _dec (k) (0 ≦ k < k _h ). Use the specified function F _f (X _dec (k)) and use the following equation (51) The obtained X' _dec (k) is calculated as a conversion coefficient of the frequency domain of the decoded signal whose time envelope shape has been corrected, and converted into a time domain signal by the predetermined inter-frequency conversion and output.

For example, when the time envelope shape of the pre-decoded signal is determined to be flat, the time envelope shape of the decoded signal can be corrected by the following processing. Any of the M _dec bands of the boundary is represented by B _dec (m) (m = 0, ..., M _dec , M _dec ≧ 1) (B _dec (0) ≧ 0, B _dec (M _dec ) < k _h ) In the frequency band B _dec (m), linear prediction is performed in the frequency direction to obtain a linear prediction coefficient α _p (m) (m = 0, ..., M _dec -1), and the predetermined function F _f (X _dec (k) is obtained. ), set to perform linear prediction inverse filter processing on the conversion coefficient X _dec (k) The definition is (N _pred ≧1), and X' _dec (k, i) is calculated as the conversion coefficient of the decoded signal whose time envelope shape has been corrected.

The time envelope correction unit 1d performs a process of correcting the shape of the time envelope of the decoded signal to be flat, and is not limited to the above example.

Fig. 67 is a view showing the configuration of the speech encoding device 2 according to the tenth embodiment. The communication device of the speech encoding device 2 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 67, the voice encoding device 2 is provided with a voice encoding unit 2a and a time envelope. The coding unit 2b and the coding sequence multiplexing unit 2c.

Fig. 68 is a flowchart showing the operation of the speech encoding device 2 according to the tenth embodiment.

The voice encoding unit 2a encodes the input voice signal (step S2-1).

The time envelope information encoding unit 2b calculates and encodes the time envelope information based on at least one of the input audio signal and the information obtained in the encoding process including the encoding result of the input audio signal in the audio encoding unit 2a. Step S2-2).

For example, the signal of the time domain in any time segment t(l) ≦i<t(l+1)), that is, the time envelope E _t (i) of the input voice signal x(i), may be The method of normalizing the power of the decoded signal in the time zone is calculated.

Even, for example, if the input audio signal in the voice encoding unit 2a is the signal X(k, i) in which the complex sub-band is calculated, the segment t(l)≦i<t(l+) can be performed at any time. 1)) is divided into M bands representing B(m)(m=0,...,M,M≧1)(B(0)≧0, B(M)<k _h ), Subband signal X(k,i)(B(m)≦k<B(m+1), t(l)≦i<t(l+1) of the input audio signal contained in the mth frequency band The time envelope E(k, i) is calculated as the time envelope of the input audio signal by normalizing the power of the sub-band signal of the input audio signal in the time zone.

The time envelope of the input audio signal is not limited to the previous example as long as it is a parameter that knows the change in the time direction of the size of the input audio signal.

Even, for example, the decoded signal x _dec (i) can be calculated based on the encoding result of the pre-recorded input audio signal in the voice encoding unit 2a, and the arbitrary time segment t(l) ≦ i < t (l+1)) The time envelope E _dec,t (i) of the decoded signal x _dec (i) is calculated as the power of the decoded signal normalized during the time period.

Even, for example, in the encoding process of the pre-recorded input audio signal in the speech encoding unit 2a, or when the sub-band signal X _dec (k, i) of the decoded signal is calculated based on the encoding result, the segment t can be performed at any time. (l) ≦i<t(l+1)) is divided into B(m)(m=0,...,M,M≧1)(B(0)≧0, B(M)<k _h ) indicates the M frequency bands of the boundary, and the sub-band signals X _dec (k, i) (B(m) ≦ k < B(m+1), t(l) of the input audio signal contained in the m-th frequency band. The time envelope E _dec (k, i) of ≦i<t(l+1)) is calculated as the power of the sub-band signal of the normalized input audio signal in the time zone as a decoded signal. Time envelope.

For example, the time envelope information encoding unit 2b calculates information indicating the flatness of the time envelope information. For example, at least one of the dispersion of the time envelope of the input audio signal and the decoded signal or a parameter similar thereto is calculated. In another example, at least one of the ratio of the sum of the time envelopes of the input audio signal and the decoded signal to the multiplied average or a parameter similar thereto is calculated. In this case, the time envelope information encoding unit 2b only needs to calculate the information indicating the flatness of the time envelope of the input audio signal as the time envelope information, and is not limited to the example of the foregoing. Then, encode the pre-recorded parameters. For example, the difference value or the absolute value of the input parameter of the input audio signal and the decoded signal is encoded. Then, for example, at least one of the value or the absolute value of the input parameter of the input audio signal is encoded. For example, if the flatness of the time envelope is to be flattened, it can be encoded by 1 bit. For example, the input audio signal for the pre-recorded time domain can be performed in 1 bit in any of the preceding time segments. The encoding may be encoded with M bits, for example, for each frequency band of the preceding M of the sub-band signals of the pre-recorded audio signal. The encoding method of the time envelope information is not limited to the pre-recording example.

For example, the time envelope information encoding unit 2b calculates information indicating the degree of elevation of the time envelope information. For example, in an arbitrary time zone t(l)≦i<t(l+1), the time envelope of the input audio signal is calculated. The maximum value of the difference value between the directions.

[Equation 57] d _{Et ,max} ( k )=max( E _t ( k , i )- E _t ( k , i -1)) d _{Edec , t ,max} ( k )=max( E _{dec , t} ( k , i )- E _{dec , t} ( k , i -1)) or d _{E max} ( k )=max( E ( k , i )- E ( k , i -1)) d _{Edec ,max} ( k )= Max( E _dec ( k , i )- E _dec ( k , i -1)) Even in these equations, the time envelope can be replaced by calculating the parameter that smoothes the time envelope to the time direction. The maximum value of the difference value in the time direction.

In this case, the time envelope information encoding unit 2b is only required to calculate the time envelope information indicating the degree of the temporal envelope of the input audio signal as the time envelope information, and is not limited to the example of the foregoing. Then, encode the pre-recorded parameters. Then, for example, at least one of a difference value of the input audio signal and the parameter of the decoded signal or an absolute value thereof is encoded. For example, if the time envelope is raised by whether it is up, it can be encoded by 1 bit. For example, the input voice signal for the pre-recorded time domain can be encoded by 1 bit in any preceding time zone. For example, when the information is encoded for each of the pre-recorded M bands of the sub-band signal of the pre-recorded audio signal, the M-bit can be used for encoding. The encoding method of the time envelope information is not limited to the pre-recording example.

Even, for example, the time envelope information encoding unit 2b calculates information indicating the degree of decline in the time envelope information. For example, in any of the time segments t(l) ≦ i < t (l+1), the minimum value of the difference value in the time direction of the time envelope of the input audio signal is calculated.

[Equation 58] d _{Et ,min} ( k )=min( E _t ( k , i )- E _t ( k , i -1)) d _{Edec , t ,min} ( k )=min( E _{dec , t} ( k , i )- E _{dec , t} ( k , i -1)) or d _{E min} ( k )=min( E ( k , i )- E ( k , i -1)) d _{Edec ,min} ( k )= Min( E _dec ( k , i )- E _dec ( k , i -1)) Even in these equations, the time envelope can be replaced by calculating the parameter that smoothes the time envelope to the time direction. The minimum value of the difference value in the time direction. In this case, the time envelope information encoding unit 2b is not limited to the example of the foregoing, as long as the information indicating the degree of decline in the time envelope of the sub-band signal to which the audio signal is input is calculated as the time envelope information. Then, encode the pre-recorded parameters. Then, for example, at least one of a difference value of the input audio signal and the parameter of the decoded signal or an absolute value thereof is encoded. For example, if the time envelope is to be frustrated by whether it is down, it can be encoded by 1 bit. For example, the input voice signal for the pre-recorded time domain can be encoded by 1 bit in any preceding time zone. For example, when the information is encoded for each of the pre-recorded M bands of the sub-band signal of the pre-recorded audio signal, the M-bit can be used for encoding. The encoding method of the time envelope information is not limited to the pre-recording example.

In the above example, the time envelope of the input audio signal can be replaced, and the audio coding unit 2a can be used in the time segment t(l) ≦i<t(l+1) in any time zone. The power of the short time segment has associated coding parameters (e.g., the gain of the codebook in CELP coding).

The code sequence multiplexer 2c is received from the voice coding unit 2a. The code sequence of the input audio signal is taken, and the time envelope shape information that has been encoded is received from the time envelope information encoding unit 2b, and multiplexed into a code sequence and output (step S2-3).

[Eleventh Embodiment]

Fig. 69 is a view showing the configuration of the sound decoding device 100 according to the eleventh embodiment. The communication device of the audio decoding device 100 receives the multiplexed code sequence output from the lower audio coding device 200, and outputs the decoded audio signal to the outside. As shown in FIG. 69, the audio decoding device 100 is provided with a code sequence inverse multiplexing unit 100a, a low frequency decoding unit 100b, a low frequency time envelope shape determining unit 100c, a low frequency time envelope correcting unit 100d, and a high frequency. The decoding unit 100e and the low frequency/high frequency signal synthesizing unit 100f.

Fig. 70 is a flowchart showing the operation of the sound decoding device according to the eleventh embodiment.

The coding sequence inverse multiplexing unit 100a divides the code sequence into a low frequency coded portion encoded by a low frequency signal and a high frequency coded portion encoded by a high frequency signal (step S100-1).

The low-frequency decoding unit 100b decodes the low-frequency coded portion that has been divided by the coded sequence inverse multiplexing unit 100a to obtain a low-frequency signal (step S100-2).

The low-frequency time envelope shape determining unit 100c is based on the information about the low-frequency time envelope shape divided by the encoded sequence inverse multiplexing unit 100a, and the low-frequency signal obtained by the low-frequency decoding unit 100b. At least one of the above determines the temporal envelope shape of the low frequency signal (step S100-3).

For example, a case in which the time envelope shape of the low-frequency signal is determined to be flat, a case in which the time envelope shape of the low-frequency signal is determined to be raised, and a case in which the time envelope shape of the low-frequency signal is determined to fall are cited.

For the determination of the temporal envelope shape of the low-frequency signal, for example, in the process of determining the temporal envelope shape of the decoded signal in the temporal envelope shape determining unit 1c, the decoded signal obtained by the audio decoding unit 1b is replaced with the low-frequency decoding unit. The low frequency signal obtained on 100b can be realized by this.

The low-frequency time envelope correcting unit 100d corrects the shape of the time envelope of the low-frequency signal output from the low-frequency decoding unit 100b based on the time envelope shape determined by the low-frequency time envelope shape determining unit 100c (step S100-4).

For the correction of the temporal envelope shape of the low-frequency signal, for example, in the correction processing of the temporal envelope shape of the decoded signal in the temporal envelope correcting unit 1d, the decoded signal obtained by the audio decoding unit 1b is replaced with the low-frequency decoding unit 100b. The low frequency signal obtained above can be realized by this.

The high frequency decoding unit 100e decodes the high frequency coded portion that has been divided by the coded sequence inverse multiplexing unit 100a to obtain a high frequency signal (step S100-5).

The high frequency signal in the high frequency decoding unit 100e is decoded by using a high frequency signal, a time domain signal, a subband signal, and a frequency. A method of decoding a coded sequence encoded by a signal of at least one of the domain signals may be implemented.

Further, for example, in the sound decoding apparatus according to the first to ninth embodiments, the high-frequency signal can be generated by generating the band expansion method of the high-frequency signal by the decoding result obtained by the low-frequency decoding unit. At this time, if the information necessary for generating the high-frequency signal by the band expansion method is included in the code sequence, the portion of the code sequence containing the information of the code becomes the high-frequency code portion. Then, the high frequency coded portion divided by the code sequence inverse multiplex unit 100a is decoded to obtain information necessary for the band extension method, and a high frequency signal is generated. On the other hand, when the information necessary for generating the high-frequency signal by the band expansion method is not included in the code sequence, the code sequence reverse multiplex unit 100a does not input the high-frequency decoding unit 100e, but The high frequency signal is generated by the predetermined processing or by the processing of the decoding result obtained on the low frequency decoding unit.

The low-frequency/high-frequency signal synthesizing unit 100f combines the low-frequency signal whose time envelope shape is corrected in the low-frequency time envelope correcting unit 100d and the high-frequency signal obtained by the high-frequency decoding unit 100e, and outputs a low-frequency component. And an audio signal of the high frequency component (step S100-6).

Fig. 71 is a view showing the configuration of the speech encoding device 200 according to the eleventh embodiment. The communication device of the speech encoding device 200 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 65, the voice encoding device 200 is provided with a low frequency encoding unit 200a and a high level. The frequency encoding unit 200b, the low-frequency time envelope information encoding unit 200c, and the code sequence multiplexing unit 200d.

Fig. 72 is a flowchart showing the operation of the speech encoding device 200 according to the eleventh embodiment.

The low frequency encoding unit 200a encodes the low frequency signal corresponding to the low frequency component of the input audio signal (step S200-1).

The high frequency encoding unit 200b encodes a high frequency signal corresponding to a high frequency component of the input audio signal (step S200-2).

The low-frequency time envelope information encoding unit 200c calculates the low-frequency time envelope shape information based on at least one of the input audio signal and the information obtained in the encoding process including the encoding result of the input audio signal in the low-frequency encoding unit 200a. It is encoded (step S200-3).

In the calculation and encoding processing of the low-frequency time envelope shape information, for example, in the calculation and encoding processing of the time envelope information of the input audio signal in the time envelope information encoding unit 2b, the input audio signal is replaced with the low frequency of the input audio signal. The signal can be similarly implemented by replacing the decoded signal with a low-frequency decoding signal obtained by decoding the encoded result of the low-frequency encoding unit 200a.

The code sequence multiplexer 200d receives the code sequence of the low frequency audio signal from the low frequency coding unit 200a, receives the code sequence of the high frequency audio signal from the high frequency coding unit 200b, and receives the coded code from the low frequency time envelope information coding unit 200c. The low-frequency time envelope shape information is multiplexed into a code sequence and output (step S200-4).

[First Modification of Sound Decoding Device According to Eleventh Embodiment]

Fig. 73 is a view showing the configuration of a first modification 100A of the speech decoding device according to the eleventh embodiment.

Fig. 74 is a flowchart showing the operation of the first modification 100A of the speech decoding device according to the eleventh embodiment.

The high frequency decoding unit 100eA decodes the high frequency coded portion that has been divided by the coded sequence inverse multiplexing unit 100a to obtain a high frequency signal (step S100-5A).

In the high-frequency decoding unit 100eA, when the low-frequency decoding signal obtained by the low-frequency decoding unit is used for decoding the high-frequency signal, the low-frequency signal whose time envelope shape is corrected in the low-frequency time envelope correcting unit 100d is used. This is the difference from the high frequency decoding unit 100e.

[Second Modification of Sound Decoding Device According to Eleventh Embodiment]

Fig. 75 is a diagram showing the configuration of a first modification 100A of the speech decoding device according to the eleventh embodiment.

The difference from the first modification of the audio decoding device according to the eleventh embodiment is that the low-frequency signal input to the low-frequency/high-frequency signal synthesizing unit 100f is not from the output of the low-frequency time envelope correcting unit 100d but from the low frequency. The output of the decoding unit 100b is this.

[12th embodiment]

Fig. 76 is a view showing the configuration of the sound decoding device 110 according to the twelfth embodiment. The communication device of the sound decoding device 110 will be recorded from the bottom The multiplexed code sequence output by the audio encoding device 210 is received, and then the decoded audio signal is output to the outside. As shown in FIG. 76, the audio decoding device 110 is functionally provided with a code sequence inverse multiplexing unit 110a, a low frequency decoding unit 100b, a high frequency decoding unit 100e, a high frequency time envelope shape determining unit 110b, and a high frequency. The time envelope correction unit 110c and the low frequency/high frequency signal synthesizing unit 100f.

Fig. 77 is a flow chart showing the operation of the sound decoding device according to the twelfth embodiment.

The coding sequence inverse multiplexing unit 110a divides the code sequence into a low frequency coded portion, a high frequency coded portion, and information on a high frequency time envelope shape (step S110-1).

The high-frequency time envelope shape determining unit 110b is based on the information about the high-frequency time envelope shape divided by the encoded sequence inverse multiplexing unit 110a, the high-frequency signal obtained by the high-frequency decoding unit 100e, and the low-frequency decoding. At least one of the low frequency signals obtained by the portion 100b determines the temporal envelope shape of the high frequency signal (step S110-2).

For example, a case in which the time envelope shape of the high-frequency signal is determined to be flat, a case in which the time envelope shape of the high-frequency signal is determined to be raised, and a case in which the time envelope shape of the high-frequency signal is determined to fall are cited.

For the determination of the temporal envelope shape of the high-frequency signal, for example, in the process of determining the temporal envelope shape of the decoded signal in the temporal envelope shape determining unit 1c, the decoded signal obtained by the audio decoding unit 1b is replaced with a high frequency. The high frequency signal obtained by the decoding unit 100e can be realized by this. Further, similarly, the solution obtained by the sound decoding unit 1b is obtained. The code signal is replaced with the low frequency signal obtained on the low frequency decoding unit 100b, thereby realizing it.

The high-frequency time envelope correction unit 110c corrects the shape of the time envelope of the high-frequency signal output from the high-frequency decoding unit 110e based on the time envelope shape determined by the high-frequency time envelope shape determining unit 110b (step S110- 3). For example, when the time envelope shape of the high-frequency signal is determined to be flat, the time envelope shape of the high-frequency signal can be corrected by the following processing.

For the correction of the temporal envelope shape of the high-frequency signal, for example, in the correction processing of the temporal envelope shape of the decoded signal in the temporal envelope correcting unit 1d, the decoded signal obtained by the audio decoding unit 1b is replaced with the high-frequency decoding. The high frequency signal obtained on the portion 100e can be realized by this.

Figure 78 is a diagram showing the configuration of the speech encoding device 210 according to the twelfth embodiment. The communication device of the audio encoding device 210 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 78, the speech encoding device 210 is functionally provided with a low frequency encoding unit 200a, a high frequency encoding unit 200b, a high frequency time envelope information encoding unit 210a, and a code sequence multiplexing unit 210b.

Fig. 79 is a flowchart showing the operation of the speech encoding device 210 according to the twelfth embodiment.

The high-frequency time envelope information encoding unit 210a is based on the input audio signal and the audio signal including the input audio signal in the low-frequency encoding unit 200a. The at least one of the information obtained in the encoding process of the code result and the information obtained in the encoding process including the encoding result of the input audio signal in the high frequency encoding unit 200b is used to calculate the high frequency time envelope shape information and Encoding (step S210-1).

In the calculation and encoding processing of the high-frequency time envelope shape information, for example, in the calculation and encoding processing of the time envelope information of the input audio signal in the time envelope information encoding unit 2b, the input audio signal is replaced with the input audio signal. The high frequency signal can be similarly realized by replacing the decoded signal with a high frequency decoding signal obtained by decoding the encoding result of the high frequency encoding unit 200b.

The code sequence multiplexer 210b receives the code sequence of the low frequency audio signal from the low frequency coding unit 200a, receives the code sequence of the high frequency audio signal from the high frequency coding unit 200b, and receives the coded code from the high frequency time envelope information coding unit 210a. The high frequency time envelope shape information is multiplexed into a code sequence and output (step S210-2).

[Thirteenth embodiment]

Fig. 80 is a view showing the configuration of the sound decoding device 120 according to the thirteenth embodiment. The communication device of the audio decoding device 120 receives the multiplexed code sequence output from the lower voice encoding device 220, and outputs the decoded audio signal to the outside. As shown in FIG. 80, the audio decoding device 120 is functionally provided with a code sequence inverse multiplexing unit 120a, a low frequency decoding unit 100b, a low frequency time envelope shape determining unit 100c, a low frequency time envelope correcting unit 100d, and a high frequency. Decoding department 100e, high frequency time envelope shape determining unit 120b, high frequency time envelope correcting unit 110c, and low frequency/high frequency signal synthesizing unit 100f.

Fig. 81 is a flowchart showing the operation of the sound decoding device 120 according to the thirteenth embodiment.

The coding sequence inverse multiplexing unit 120a divides the code sequence into a low-frequency code portion, a high-frequency code portion, information on a low-frequency time envelope shape, and information on a high-frequency time envelope shape (step S120-1).

At this time, the information about the shape of the envelope of the low-frequency time and the information about the shape of the envelope of the high-frequency time may be, for example, from the information about the shape of the low-frequency time envelope separately encoded, and the shape of the envelope of the high-frequency time. The coding sequence of the information is divided, or may be segmented from a coding sequence containing information about the shape of the frequency time envelope that is combined and encoded, and information about the shape of the envelope of the high frequency. Even, for example, the information about the shape of the envelope of the low-frequency time and the information about the shape of the envelope of the high-frequency time and the information about the shape of the envelope of the high-frequency time are encoded as a code sequence containing the information, and the division is performed.

The high-frequency time envelope shape determining unit 120b is based on the information about the high-frequency time envelope shape divided by the encoded sequence inverse multiplexing unit 120a, the low-frequency signal obtained by the low-frequency decoding unit 100b, and the low-frequency time envelope. The correction unit 100d corrects at least one of the low-frequency signals of the time envelope shape to determine the temporal envelope shape of the high-frequency signal (step S120-2).

For example, a case in which the time envelope shape of the high-frequency signal is determined to be flat is determined, and the time envelope shape of the high-frequency signal is determined to be raised. Case, the case of the time envelope shape of the high-frequency signal is determined to fall.

In the process of determining the high-frequency time envelope shape in the high-frequency time envelope shape determining unit 120b, the low-frequency signal having the time envelope shape corrected in the low-frequency time envelope correcting unit 100d is in the time envelope shape determining unit 1c. In the process of determining the temporal envelope shape of the decoded signal, the decoded signal obtained by the audio decoding unit 1b is replaced with a low-frequency signal whose time envelope shape is corrected in the low-frequency time envelope correcting unit 100d.

Fig. 82 is a view showing the configuration of the voice encoding device 220 according to the thirteenth embodiment. The communication device of the speech encoding device 220 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 82, the speech encoding device 220 is provided with a low frequency encoding unit 200a, a high frequency encoding unit 200b, a low frequency time envelope information encoding unit 200c, a high frequency time envelope information encoding unit 220a, and a coding sequence. The multiplexing unit 220b.

Fig. 83 is a flow chart showing the operation of the speech encoding device 220 according to the thirteenth embodiment.

The high-frequency time envelope information encoding unit 220a is based on the input audio signal, the information obtained in the encoding process including the encoding result of the input audio signal in the low-frequency encoding unit 200a, and the encoding including the input audio signal in the high-frequency encoding unit 200b. The high-frequency time envelope shape information is calculated by at least one of the information obtained during the encoding process and the information obtained during the encoding process of the low-frequency time envelope information encoding unit 200c including the encoding result of the low-frequency time envelope information. And coding Step S220-1).

The calculation and encoding processing of the high-frequency time envelope shape information can be realized, for example, in the same manner as the calculation and encoding processing of the time envelope information of the high-frequency signal in the high-frequency time envelope information encoding unit 210a. Even, for example, it is also possible to encode the result based on the low frequency time envelope information. For example, in the case where the low-frequency time envelope is obtained as a result of the encoding of the low-frequency time envelope information, the high-frequency time envelope information can be encoded as a high-frequency time envelope.

The code sequence multiplexer 220b receives the code sequence of the low frequency audio signal from the low frequency coding unit 200a, receives the code sequence of the high frequency audio signal from the high frequency coding unit 200b, and receives the coded code from the low frequency time envelope information coding unit 200c. The low-frequency time envelope shape information is received from the high-frequency time envelope information encoding unit 210a to receive the encoded high-frequency time envelope shape information, and is multiplexed into a code sequence and output (step S220-2).

At this time, for the information about the shape of the low-frequency time envelope and the information about the shape of the high-frequency time envelope shape, for example, the separately encoded information about the shape of the low-frequency time envelope and the information about the shape of the high-frequency time envelope may be received. Alternatively, information about the shape of the frequency time envelope encoded by the combination and information about the shape of the envelope of the high frequency time may be charged. Even, for example, information about the shape of the low-frequency time envelope, which is encoded by a single message, and information about the shape of the envelope of the high-frequency time may be received.

[First Modification of Sound Decoding Device According to Tenth Embodiment]

Fig. 84 is a diagram showing the configuration of a first modification 120A of the speech decoding device according to the thirteenth embodiment. The difference from the audio decoding device 120 of the thirteenth embodiment is that the high-frequency decoding unit 100eA uses the low-frequency time envelope shape corrected in the low-frequency time envelope correcting unit 100d during decoding of the high-frequency signal. Signal this.

Fig. 85 is a flowchart showing the operation of the first modification 120A of the speech decoding device according to the thirteenth embodiment. In step 100-5A of FIG. 85, when the low-frequency decoding signal obtained by the low-frequency decoding unit 100b is used for decoding the high-frequency signal, the low-frequency envelope of the time envelope shape corrected in the low-frequency time envelope correcting unit 100d is used. Signal.

[Second Modification of Sound Decoding Device According to Tenth Embodiment]

Fig. 86 is a diagram showing the configuration of a second modification 120B of the speech decoding device according to the thirteenth embodiment. The difference from the first modification of the audio decoding device according to the thirteenth embodiment is that the low-frequency signal input to the low-frequency/high-frequency signal synthesizing unit 100f is not derived from the output of the low-frequency time envelope correcting unit 100d but from the low frequency. The output of the decoding unit 100b is this.

Fig. 87 is a flowchart showing the operation of the second modification 120B of the speech decoding device according to the thirteenth embodiment. In step S100-6 of Fig. 87, the low frequency signal from the low frequency decoding unit 100b and the high frequency signal from the high frequency time envelope correcting unit 110c are combined.

[Third Modification of Sound Decoding Device According to Tenth Embodiment]

Fig. 185 is a diagram showing the configuration of a third modification 120C of the speech decoding device according to the thirteenth embodiment.

Fig. 186 is a flowchart showing the operation of the third modification 120C of the speech decoding device according to the thirteenth embodiment.

The difference between the present modification and the audio decoding device 120 according to the thirteenth embodiment is that the low-frequency time envelope shape determining unit 100c and the high-frequency time envelope correcting unit 110c are provided with a low-frequency time envelope shape determining unit 120c. The high frequency time envelope correcting unit 120d does this.

In the present modification, the difference between the low-frequency time envelope shape determining unit 120c and the pre-recording low-frequency envelope shape determining unit 100c is notified to the high-frequency time envelope correcting unit 120d by the determined time envelope shape.

The difference between the high-frequency time envelope correcting unit 120d and the pre-recorded high-frequency envelope correction unit 110c is based on the time envelope shape determined by the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope shape determining unit 120c. At least one of the determined time envelope shapes corrects the shape of the time envelope of the high frequency signal output from the high frequency decoding unit 100e (S120-3).

For example, when the time envelope shape is determined to be flat in the low-frequency time envelope shape determining unit 120c, the time envelope shape determined by the high-frequency time envelope shape determining unit 120b is output from the high-frequency decoding unit 100e. The shape of the time envelope of the high frequency signal is corrected to be flat. Even if, for example, the time envelope shape is determined to be non-flat at the low-frequency time envelope shape determining unit 120c, the high-frequency time envelope is applied. The shape of the time envelope determined by the shape determining unit 120b does not correct the shape of the time envelope of the high-frequency signal output from the high-frequency decoding unit 100e. The same is true for ascending and falling, and the shape of the time envelope is not limited.

[Fourth Modification of the Sound Decoding Device of the 13th Embodiment]

Fig. 187 is a diagram showing the configuration of a fourth modification 120D of the speech decoding device according to the thirteenth embodiment.

Figure 188 is a flowchart showing the operation of the fourth modification 120D of the speech decoding device according to the thirteenth embodiment.

The difference between the present modification and the audio decoding device 120 according to the thirteenth embodiment is that the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d are provided with a high-frequency time envelope shape determining unit 120bA. The low frequency time envelope correcting unit 120e.

In the present modification, the difference between the high-frequency time envelope shape determining unit 120bA and the pre-recording high-frequency envelope shape determining unit 120b is notified to the low-frequency time envelope correcting unit 120e by the determined time envelope shape.

The determination of the temporal envelope shape in the high-frequency time envelope shape determining unit 120bA may be based on, for example, a frequency power distribution based on the pre-recorded low-frequency signal. Even, for example, the frame length at the time of decoding of the high frequency signal obtained by the encoding sequence inverse multiplexing unit 120a can be used. For example, it can be determined that the frame length is flat when the frame length is long. When the frame length is short, it is raised or lowered, and can be similarly determined in the high-frequency envelope shape determining unit 120b.

The difference between the low-frequency time envelope correction unit 120e and the pre-recorded low-frequency envelope correction unit 100d is determined based on the time envelope shape determined by the low-frequency time envelope shape determining unit 100c and the high-frequency time envelope shape determining unit 120bA. At least one of the temporal envelope shapes corrects the shape of the time envelope of the low frequency signal output from the low frequency decoding unit 100b (S120-4).

For example, when the time envelope shape is determined to be flat in the high-frequency time envelope shape determining unit 120bA, the time envelope shape determined by the low-frequency time envelope shape determining unit 100c is output from the low-frequency decoding unit 100b. The shape of the time envelope of the low frequency signal is corrected to be flat. For example, when the time envelope shape is determined to be flat in the high-frequency time envelope shape determining unit 120bA, the time envelope shape determined by the low-frequency time envelope shape determining unit 100c is not from the low-frequency decoding unit 100b. The shape of the time envelope of the output low frequency signal is corrected to be flat. The same is true for ascending and falling, and the shape of the time envelope is not limited.

[Fifth Modification of Sound Decoding Device According to Tenth Embodiment]

Fig. 189 is a diagram showing the configuration of a fifth modification 120E of the speech decoding device according to the thirteenth embodiment.

Figure 190 is a flowchart showing the operation of a fifth modification 120E of the speech decoding device according to the thirteenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 120c, the high-frequency envelope correction unit 120d, the high-frequency envelope shape determining unit 120bA, and the low-frequency envelope correction unit 120e are provided.

[Sixth Modification of Sound Decoding Device According to Tenth Embodiment]

Fig. 191 is a diagram showing the configuration of a sixth modification 120F of the speech decoding device according to the thirteenth embodiment.

Fig. 192 is a flowchart showing the operation of the sixth modification 120F of the speech decoding device according to the thirteenth embodiment.

The difference between the present modification and the audio decoding device 120 according to the thirteenth embodiment is that the low-frequency envelope shape determining unit 100c and the high-frequency envelope shape determining unit 120b further include the time envelope shape determining unit 120f.

The time envelope shape determining unit 120f is based on the information about the low-frequency time envelope shape from the encoding sequence inverse multiplexing unit 120a, the information on the high-frequency time envelope shape, the low-frequency signal from the low-frequency decoding unit 100b, and the high-frequency decoding unit. At least one of the high frequency signals of 100e determines the time envelope shape (S120-5). The determined time envelope shape is notified to the low frequency time envelope correcting unit 100d and the high frequency time envelope correcting unit 110c.

For example, the shape of the time envelope is determined to be flat. Even for example, the shape of the time envelope is determined to rise. Even for example, the shape of the time envelope is determined to fall. The time envelope shape determined is not limited to The above example.

In the time envelope shape determining unit 120f, the time envelope shape can be determined in the same manner as, for example, the low-frequency time envelope shape determining units 100c and 120c and the high-frequency time envelope shape determining units 120b and 120bA. The method of determining the shape of the time envelope is not limited to the above example.

[Seventh Modification of Sound Decoding Device According to Tenth Embodiment]

Fig. 193 is a diagram showing the configuration of a seventh modification 120G of the speech decoding device according to the thirteenth embodiment.

Fig. 194 is a flowchart showing the operation of the seventh modification 120G of the speech decoding device according to the thirteenth embodiment.

The difference between the present modification and the first modification 120A of the audio decoding device according to the thirteenth embodiment is that the low-frequency time envelope shape determining unit 100c and the high-frequency time envelope correcting unit 110c are provided with a low-frequency time envelope. The shape determining unit 120c and the high-frequency time envelope correcting unit 120d.

[Eighth Modification of Sound Decoding Device According to Tenth Embodiment]

Fig. 195 is a diagram showing the configuration of an eighth modification 120H of the speech decoding device according to the thirteenth embodiment.

Fig. 196 is a flowchart showing the operation of the eighth modification 120H of the speech decoding device according to the thirteenth embodiment.

The present modification and the sound solution described in the thirteenth embodiment In addition to the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d, the high-frequency time envelope shape determining unit 120bA and the low-frequency time envelope correcting unit 120e are provided in the first modification 108A of the code device. point.

[Ninth Modification of Sound Decoding Device According to Tenth Embodiment]

Figure 197 is a diagram showing the configuration of a ninth modification 120I of the speech decoding device according to the thirteenth embodiment.

Figure 198 is a flowchart showing the operation of the ninth modification 120I of the speech decoding device according to the thirteenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 120c, the high-frequency envelope correction unit 120d, the high-frequency envelope shape determining unit 120bA, and the low-frequency envelope correction unit 120e are provided.

[Tenth Modification of Sound Decoding Device According to Tenth Embodiment]

Figure 199 is a diagram showing the configuration of a tenth modification 120J of the speech decoding device according to the thirteenth embodiment.

Fig. 200 is a flowchart showing the operation of the tenth modification 120J of the speech decoding device according to the thirteenth embodiment.

The difference between the present modification and the first modification 120A of the audio decoding device according to the thirteenth embodiment is that the low-frequency envelope shape determining unit 100c and the high-frequency envelope shape determining unit 120b further have time envelope shape determination. Part 120f this point.

[Eleventh Modification of Sound Decoding Device According to Tenth Embodiment]

Figure 201 is a diagram showing the configuration of an eleventh modification 120K of the speech decoding device according to the thirteenth embodiment.

Fig. 202 is a flowchart showing the operation of the eleventh modification 120K of the speech decoding device according to the thirteenth embodiment.

The difference between the present modification and the second modification 120B of the audio decoding device according to the thirteenth embodiment is that the low-frequency time envelope shape determining unit 100c and the high-frequency time envelope correcting unit 110c are provided with a low-frequency time envelope. The shape determining unit 120c and the high-frequency time envelope correcting unit 120d.

[Twelfth Modification of Sound Decoding Device According to Tenth Embodiment]

Fig. 203 is a diagram showing the configuration of a twelfth modification 120L of the speech decoding device according to the thirteenth embodiment.

Fig. 204 is a flowchart showing the operation of the twelfth modification 120L of the speech decoding device according to the thirteenth embodiment.

The difference between the present modification and the second modification 120B of the audio decoding device according to the thirteenth embodiment is that the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d are provided with high-frequency time. The envelope shape determining unit 120bA and the low-frequency time envelope correcting unit 120e.

[Thirteen Modification of Sound Decoding Device According to Tenth Embodiment]

Figure 205 is a diagram showing the configuration of a thirteenth modification 120M of the audio decoding device according to the thirteenth embodiment.

Fig. 206 is a flowchart showing the operation of the thirteenth modification 120M of the speech decoding device according to the thirteenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 120c, the high-frequency envelope correction unit 120d, the high-frequency envelope shape determining unit 120bA, and the low-frequency envelope correction unit 120e are provided.

[Fourth Modification of the Sound Decoding Device of the 13th Embodiment]

Figure 207 is a diagram showing the configuration of a fourteenth modification 120N of the speech decoding device according to the thirteenth embodiment.

Figure 208 is a flowchart showing the operation of the fourteenth modification 120N of the voice decoding device according to the thirteenth embodiment.

The difference between the present modification and the second modification 120B of the audio decoding device according to the thirteenth embodiment is that the low-frequency envelope shape determining unit 100c and the high-frequency envelope shape determining unit 120b further have time envelope shape determination. Part 120f this point.

[Fourteenth embodiment]

Fig. 88 is a view showing the configuration of the sound decoding device 130 according to the fourteenth embodiment. The communication device of the audio decoding device 130 receives the multiplexed code sequence output from the lower voice encoding device 230, and outputs the decoded audio signal to the outside. Sound decoding As shown in FIG. 88, the apparatus 130 is provided with a code sequence inverse multiplexing unit 110a, a low frequency decoding unit 100b, a high frequency time envelope shape determining unit 110b, a high frequency time envelope correcting unit 130a, and a high frequency. The decoding unit 130b and the low frequency/high frequency signal synthesizing unit 100f.

Figure 89 is a flowchart showing the operation of the sound decoding device according to the thirteenth embodiment.

The high-frequency time envelope correction unit 130a corrects the shape of the time envelope of the low-frequency signal input to the high-frequency decoding unit 130b based on the time envelope shape determined by the high-frequency time envelope shape determining unit 110b (step S130-1). ). The correction of the temporal envelope shape in the high-frequency time envelope correcting unit 130a is, for example, the correction of the temporal envelope shape of the decoded signal in the temporal envelope correcting unit 1d, and the decoding signal obtained by the audio decoding unit 1b is replaced. The low frequency signal obtained on the low frequency decoding unit 100b can be realized by this.

The high frequency decoding unit 130b decodes the high frequency coded portion that has been divided by the coded sequence inverse multiplexing unit 100a to obtain a high frequency signal (step S130-2).

In the high-frequency decoding unit 130b, when the low-frequency decoding signal obtained by the low-frequency decoding unit is used for decoding the high-frequency signal, the low-frequency signal whose time envelope shape is corrected in the high-frequency time envelope correcting unit 130a is used. The point is different from the high frequency decoding unit 100e.

Fig. 90 is a view showing the configuration of the speech encoding device 230 according to the fourteenth embodiment. The communication device of the audio encoding device 230 receives the audio signal as the encoding target from the outside, and The encoded code sequence is output to the outside. As shown in FIG. 90, the voice encoding device 230 is functionally provided with a low frequency encoding unit 200a, a high frequency encoding unit 200b, a high frequency time envelope information encoding unit 230a, and a code sequence multiplexing unit 210b.

Fig. 91 is a flowchart showing the operation of the speech encoding device 230 according to the fourteenth embodiment.

The high-frequency time envelope information encoding unit 230a is based on the input audio signal, the information obtained in the encoding process including the encoding result of the input audio signal in the low-frequency encoding unit 200a, and the encoding including the input audio signal in the high-frequency encoding unit 200b. The high frequency time envelope shape information is calculated and encoded by at least one of the obtained information obtained during the encoding process (step S230-1).

The calculation and encoding processing of the high-frequency time envelope shape information can be realized, for example, in the same manner as the calculation and encoding processing of the time envelope information of the low-frequency signal in the low-frequency time envelope information encoding unit 200c. However, in the calculation and encoding processing of the high-frequency time envelope shape information, it is also possible to use the information obtained in the encoding process including the encoding result of the input audio signal in the high-frequency encoding unit 200b, and to use the input audio signal. The time envelope information of the low frequency signal of the low frequency decoding signal is calculated and encoded differently.

[Fifteenth embodiment]

Fig. 92 is a diagram showing the configuration of the sound decoding device 140 according to the fifteenth embodiment. The communication device of the sound decoding device 140 will be recorded from the bottom The multiplexed code sequence output by the audio encoding device 240 is received, and then the decoded audio signal is output to the outside. As shown in FIG. 92, the audio decoding device 140 is functionally provided with a code sequence inverse multiplexing unit 120a, a low frequency decoding unit 100b, a low frequency time envelope shape determining unit 100c, a low frequency time envelope correcting unit 100d, and a high frequency. The time envelope shape determining unit 120b, the high frequency time envelope correcting unit 130a, the high frequency decoding unit 130b, and the low frequency/high frequency signal synthesizing unit 100f.

Figure 93 is a flowchart showing the operation of the sound decoding device according to the fifteenth embodiment. The code sequence demultiplexing unit 120a and the high frequency time envelope shape determining unit 120b perform the same operations as the code sequence inverse multiplexing unit 120a and the high frequency time envelope shape determining unit 120b in the thirteenth embodiment (step S120). -1, S120-2). The high-frequency time envelope correction unit 130a and the high-frequency decoding unit 130b perform the same operations as the high-frequency time envelope correction unit 130a and the high-frequency decoding unit 130b in the fourteenth embodiment (steps S130-1 and S130-2).

Fig. 94 is a view showing the configuration of the speech encoding device 240 according to the fifteenth embodiment. The communication device of the speech encoding device 240 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 94, the voice encoding device 240 is functionally provided with a low frequency encoding unit 200a, a high frequency encoding unit 200b, a low frequency time envelope information encoding unit 200c, a high frequency time envelope information encoding unit 220a, and a coding sequence. The multiplexing unit 220b.

Fig. 95 is a flowchart showing the operation of the speech encoding device 240 according to the fifteenth embodiment.

[First Modification of Sound Decoding Device According to Fifteenth Embodiment]

Fig. 96 is a view showing the configuration of a first modification 140A of the speech decoding device according to the fifteenth embodiment.

Fig. 97 is a flowchart showing the operation of the first modification 140A of the speech decoding device according to the fifteenth embodiment.

The high-frequency time envelope correcting unit 140a corrects the time envelope of the low-frequency signal whose time envelope shape has been corrected in the low-frequency time envelope correcting unit 100d based on the time envelope shape determined by the high-frequency time envelope shape determining unit 120b. Shape (step S140-1). The difference from the high-frequency time envelope correcting unit 130a is that the input signal is a low-frequency signal whose time envelope shape has been corrected in the low-frequency time envelope correcting unit 100d.

[Second Modification of Sound Decoding Device According to Fifteenth Embodiment]

Fig. 98 is a diagram showing the configuration of a second modification 140B of the speech decoding device according to the fifteenth embodiment.

The difference from the first modification of the audio decoding device according to the embodiment is the low frequency signal used for the synthesis processing by the low frequency/high frequency signal synthesizing unit 100f, and the time envelope is not corrected in the low frequency time envelope correction unit 100d. The low frequency signal of the shape is changed to the low frequency signal which has been decoded by the low frequency decoding unit 100b.

[Third Modification of Sound Decoding Device According to Fifteenth Embodiment]

Fig. 209 is a diagram showing the configuration of a third modification 140C of the speech decoding device according to the fifteenth embodiment.

Fig. 210 is a flowchart showing the operation of a third modification 140C of the speech decoding device according to the fifteenth embodiment.

The difference between the present modification and the audio decoding device 140 according to the fifteenth embodiment is that the low-frequency time envelope shape determining unit 100c and the high-frequency time envelope correcting unit 130a further include a low-frequency time envelope shape determining unit 120c. The high frequency time envelope correcting unit 140b.

The difference between the high-frequency time envelope correction unit 140b and the pre-recorded high-frequency envelope correction unit 130a is based on the time envelope shape determined by the high-frequency time envelope shape determining unit 120b and the low-frequency envelope shape determining unit 120c. At least one of the determined time envelope shapes is used to correct the shape of the time envelope of the low frequency signal input to the high frequency decoding unit 130b (S140-2).

For example, when the time envelope shape is determined to be flat in the low-frequency time envelope shape determining unit 120c, the time envelope shape determined by the high-frequency time envelope shape determining unit 120b is input to the high-frequency decoding unit 130b. The shape of the time envelope of the low frequency signal is corrected to be flat. For example, when the time envelope shape is determined to be non-flat in the low-frequency time envelope shape determining unit 120c, the high-frequency decoding unit is not used regardless of the time envelope shape determined by the high-frequency time envelope shape determining unit 120b. The shape of the time envelope of the low frequency signal input by 130b is corrected to be flat. The same is true for ascending and falling, and the shape of the time envelope is not limited.

[Fourth Modification of the Sound Decoding Device According to the 15th Embodiment]

Figure 211 is a diagram showing the configuration of a fourth modification 140D of the speech decoding device according to the fifteenth embodiment.

Fig. 212 is a flowchart showing the operation of the fourth modification 140D of the speech decoding device according to the fifteenth embodiment.

The difference between the present modification and the audio decoding device 140 according to the fifteenth embodiment is that the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d are provided with a high-frequency time envelope shape determining unit 120bA. The low frequency time envelope correcting unit 120e.

[Fifth Modification of Sound Decoding Device According to Fifteenth Embodiment]

Figure 213 is a diagram showing the configuration of a fifth modification 140E of the speech decoding device according to the fifteenth embodiment.

Figure 214 is a flowchart showing the operation of a fifth modification 140E of the speech decoding device according to the fifteenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 120c, the pre-recording high-frequency envelope correction unit 140b, the pre-recording high-frequency envelope shape determining unit 120bA, and the pre-recording low-frequency envelope correction unit 120e are provided.

[Fifth Modification of Sound Decoding Device According to Fifteenth Embodiment]

Figure 215 is a sixth diagram of the voice decoding device according to the fifteenth embodiment. Illustration of the configuration of the modification 140F.

Figure 216 is a flowchart showing the operation of the sixth modification 140F of the speech decoding device according to the fifteenth embodiment.

The difference between the present modification and the audio decoding device 140 according to the fifteenth embodiment is that the low-frequency envelope shape determining unit 100c and the high-frequency envelope shape determining unit 120b further include the time envelope shape determining unit 120f.

[Seventh Modification of Sound Decoding Device According to Fifteenth Embodiment]

Fig. 217 is a diagram showing the configuration of a seventh modification 140G of the speech decoding device according to the fifteenth embodiment.

Figure 218 is a flowchart showing the operation of the seventh modification 140G of the speech decoding device according to the fifteenth embodiment.

The difference between the present modification and the first modification 140A of the audio decoding device according to the fifteenth embodiment is that the low-frequency envelope type determining unit 100c and the high-frequency envelope correction unit 140a are provided with a low-frequency time envelope. The shape determining unit 120c and the high-frequency time envelope correcting unit 140b.

In the present modification, the high-frequency time envelope correcting unit 140b is based on the time envelope shape determined by the high-frequency time envelope shape determining unit 120b and the time envelope shape determined by the low-frequency time envelope shape determining unit 120c. At least one or more of them corrects the shape of the time envelope of the low-frequency signal whose time envelope shape has been corrected, which is input to the high-frequency decoding unit 130b (S140-2).

[Eighth Modification of Sound Decoding Device According to Fifteenth Embodiment]

Figure 219 is a diagram showing the configuration of an eighth modification 140H of the speech decoding device according to the fifteenth embodiment.

Fig. 220 is a flowchart showing the operation of the eighth modification 140H of the speech decoding device according to the fifteenth embodiment.

The difference between the present modification and the first modification 140A of the audio decoding device according to the fifteenth embodiment is that the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d are provided with high-frequency time. The envelope shape determining unit 120bA and the low-frequency time envelope correcting unit 120e.

[Ninth Modification of Sound Decoding Device According to Fifteenth Embodiment]

Fig. 221 is a diagram showing the configuration of a ninth modification 140I of the speech decoding device according to the fifteenth embodiment.

Figure 222 is a flowchart showing the operation of the ninth modification 140I of the speech decoding device according to the fifteenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 120c, the pre-recording high-frequency envelope correction unit 140b, the pre-recording high-frequency envelope shape determining unit 120bA, and the pre-recording low-frequency envelope correction unit 120e are provided.

[Tenth Modification of Sound Decoding Device According to Fifteenth Embodiment]

Figure 223 is a 10th aspect of the voice decoding device according to the fifteenth embodiment. Illustration of the configuration of the modification 140J.

Figure 224 is a flowchart showing the operation of the tenth modification 140J of the speech decoding device according to the fifteenth embodiment.

The difference between the present modification and the first modification 140A of the audio decoding device according to the fifteenth embodiment is that the low-frequency envelope shape determining unit 100c and the high-frequency envelope shape determining unit 120b further have time envelope shape determination. Part 120f this point.

[Eleventh Modification of the Sound Decoding Device According to the Fifteenth Embodiment]

Figure 225 is a diagram showing the configuration of an eleventh modification 140K of the speech decoding device according to the fifteenth embodiment.

Figure 226 is a flowchart showing the operation of the eleventh modification 140K of the speech decoding device according to the fifteenth embodiment.

The difference between the present modification and the second modification 140B of the audio decoding device according to the fifteenth embodiment is that the low-frequency time envelope shape determining unit 100c and the high-frequency time envelope correcting unit 140a are provided with a low-frequency time envelope. The shape determining unit 120c and the high-frequency time envelope correcting unit 140b.

[Twelfth Modification of Sound Decoding Device According to Fifteenth Embodiment]

Figure 227 is a diagram showing the configuration of a twelfth modification 140L of the speech decoding device according to the fifteenth embodiment.

Fig. 228 is a flowchart showing the operation of the twelfth modification 140L of the speech decoding device according to the fifteenth embodiment.

The difference between the present modification and the second modification 140B of the audio decoding device according to the fifteenth embodiment is that the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d are provided with high-frequency time. The envelope shape determining unit 120bA and the low-frequency time envelope correcting unit 120e.

[Thirteenth Modification of the Sound Decoding Device According to the Fifteenth Embodiment]

Figure 229 is a diagram showing the configuration of a thirteenth modification 140M of the speech decoding device according to the fifteenth embodiment.

Fig. 230 is a flowchart showing the operation of the thirteenth modification 140M of the speech decoding device according to the fifteenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 120c, the pre-recording high-frequency envelope correction unit 140b, the pre-recording high-frequency envelope shape determining unit 120bA, and the pre-recording low-frequency envelope correction unit 120e are provided.

[Fourth Modification of the Sound Decoding Device According to the 15th Embodiment]

Fig. 231 is a diagram showing the configuration of a fourteenth modification 140N of the speech decoding device according to the fifteenth embodiment.

Figure 232 is a flowchart showing the operation of a fourteenth modification 140N of the voice decoding device according to the fifteenth embodiment.

The difference between the present modification and the second modification 140B of the audio decoding device according to the fifteenth embodiment is that the low-frequency time envelope shape determining unit 100c and the high-frequency time envelope shape determining unit 120b are provided. The time envelope shape determining unit 120f is used.

[Sixth embodiment]

Fig. 99 is a diagram showing the configuration of the speech decoding device 150 according to the sixteenth embodiment. The communication device of the audio decoding device 150 receives the multiplexed code sequence output from the lower voice coding device 250, and outputs the decoded audio signal to the outside. As shown in FIG. 99, the audio decoding device 150 is functionally provided with a code sequence inverse multiplexing unit 150a, a switch group 150b, a low frequency decoding unit 100b, a low frequency time envelope shape determining unit 100c, and a low frequency time envelope correcting unit. 100d, high frequency decoding unit 100e, high frequency time envelope shape determining unit 120b, high frequency time envelope correcting unit 110c, and low frequency/high frequency signal synthesizing unit 150c.

Figure 100 is a flowchart showing the operation of the sound decoding device according to the sixteenth embodiment.

The coding sequence inverse multiplexing unit 150a divides the code sequence into high frequency signal generation control information, a low frequency coding portion, and information on the time envelope shape (step S150-1).

Based on the high frequency signal generation control information obtained by the inverse multiplex processing unit 150a of the code sequence, it is determined whether or not a high frequency signal is generated (step S150-2).

To generate the high frequency signal, the encoding sequence inverse multiplexing unit 150a extracts the high frequency encoding portion from the encoding sequence (step S150-3). Then, using the high frequency encoding portion of the encoding sequence to generate a high frequency signal, and then determining the time envelope shape of the high frequency signal, the time envelope of the high frequency signal The shape of the network is corrected.

Further, the order of the processes of steps S150-2 and S150-3 is not limited to the sequence of the flowchart of FIG. 100 as long as it is determined before the high-frequency time envelope shape and the high-frequency code portion decoding process. .

The low-frequency/high-frequency signal synthesizing unit 150c determines that the high-frequency signal has been corrected from the time envelope shape and the low-frequency signal and the time envelope shape have been corrected if the high-frequency signal is to be generated based on the high-frequency signal generation information. When the output audio signal is synthesized, if it is determined that the high frequency signal is not to be generated based on the high frequency signal generation information, the output audio signal is synthesized from the low frequency signal whose time envelope shape has been corrected (step S150-4). However, when it is determined that the high frequency signal is not generated, and the low frequency signal whose time envelope shape has been corrected is in an outputtable state and is input to the low frequency/high frequency signal synthesizing unit 150c, it may be The input low frequency signal is directly output.

Fig. 101 is a view showing the configuration of the speech encoding device 250 according to the sixteenth embodiment. The communication device of the speech encoding device 250 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 101, the voice encoding device 250 is provided with a high frequency signal generation control information encoding unit 250a, a low frequency encoding unit 200a, a high frequency encoding unit 200b, a low frequency time envelope information encoding unit 200c, and a high frequency. The time envelope information encoding unit 220a and the code sequence multiplexing unit 250b.

Figure 102 is a voice encoding device according to a sixteenth embodiment. Flow chart of the action of 250.

The high-frequency signal generation control information encoding unit 250a determines whether to generate a high-frequency signal based on at least one of the input audio signal and the high-frequency signal generation control instruction signal, and encodes the high-frequency signal generation control information (step S250- 1). For example, if the input audio signal is a signal including a frequency band encoded in the high frequency encoding unit 200b, it is determined that a high frequency signal is to be generated. Then, for example, if the high frequency signal is generated by the high frequency signal generation control instruction signal, it is determined that the high frequency signal is to be generated. Then, for example, the two methods described above may be combined. For example, when one of the two methods is previously determined to determine that a high frequency signal is to be generated, it is determined that a high frequency signal is to be generated.

The high-frequency signal generation control information can be encoded, for example, by indicating whether or not to generate a high-frequency signal.

However, there is no limitation on whether or not to generate a high-frequency signal and a method of encoding the high-frequency signal generation control information.

When the high-frequency signal generation control information encoding unit 250a determines that a high-frequency signal is to be generated, the high-frequency encoding unit 200b encodes the high-frequency signal corresponding to the high-frequency component of the input audio signal, at a high-frequency time. The envelope information encoding unit 220a calculates the high frequency time envelope shape information and encodes it. On the other hand, when the high-frequency signal generation control information encoding unit 250a determines that the high-frequency signal is not to be generated, the encoding of the high-frequency signal and the calculation and encoding of the high-frequency time envelope shape information are not performed (step S250-2). ).

The code sequence multiplexer 250c is generated from high frequency signals The control information encoding unit 250a receives the encoded high frequency signal generation control information, receives the code sequence of the low frequency audio signal from the low frequency encoding unit 200a, and receives the encoded low frequency time envelope shape information from the low frequency time envelope information encoding unit 200c. When the high-frequency signal generation control information encoding unit 250a determines that a high-frequency signal is to be generated, the high-frequency encoding unit 200b receives the encoded sequence of the high-frequency audio signal, and receives the high-frequency time envelope information encoding unit 210a. The high frequency time envelope shape information that has been encoded is multiplexed into a code sequence and output (step S250-3).

When the high-frequency signal generation control information encoding unit 250a determines that the high-frequency signal is to be generated, the information about the shape of the low-frequency time envelope and the information about the shape of the high-frequency time envelope shape may be, for example, separately received. The information about the shape of the envelope of the low-frequency time and the information about the shape of the envelope of the high-frequency time, or the information about the shape of the envelope of the low-frequency time and the information about the shape of the envelope of the high-frequency time can be combined and encoded. Charged. Even, for example, information about the low frequency time envelope information encoded by a single message and information about the high frequency time envelope information may be received.

[First Modification of Sound Decoding Device According to Sixteenth Embodiment]

Fig. 103 is a diagram showing the configuration of a first modification 150A of the speech decoding device according to the sixteenth embodiment.

Fig. 104 is a flowchart showing the operation of the first modification 150A of the speech decoding device according to the sixteenth embodiment. The difference from the sound decoding device 150 of the sixteenth embodiment is in the high frequency decoding unit 100eA. At the time of decoding the high-frequency signal, the low-frequency signal whose time envelope shape is corrected in the low-frequency time envelope correcting unit 100d is used. In step 100-5A of FIG. 104, when the low-frequency decoding signal obtained by the low-frequency decoding unit 100b is used for decoding the high-frequency signal, the low-frequency time envelope shape corrected by the low-frequency time envelope correcting unit 100d is used. Signal.

Further, the order of the processes of steps S150-2 and S150-3 is not limited to the sequence of the flowchart of FIG. 104 as long as it is determined before the high-frequency time envelope shape and the high-frequency code portion decoding process. .

[Second Modification of Sound Decoding Device According to Sixteenth Embodiment]

Fig. 105 is a diagram showing the configuration of a second modification 150B of the speech decoding device according to the sixteenth embodiment. The difference from the first modification of the audio decoding device according to the sixteenth embodiment is that the low frequency signal input to the low frequency/high frequency signal synthesizing unit 150c is not from the output of the low frequency time envelope correcting unit 100d but from the low frequency. The output of the decoding unit 100b is this.

[Third Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 233 is a diagram showing the configuration of a third modification 150C of the speech decoding device according to the sixteenth embodiment.

Figure 234 is a flowchart showing the operation of a third modification 150C of the speech decoding device according to the sixteenth embodiment.

The difference between the present modification and the speech decoding device 150 according to the sixteenth embodiment is the low frequency time envelope shape determining unit. In addition to the high frequency time envelope correcting unit 110c, the low frequency time envelope shape determining unit 120c and the high frequency time envelope correcting unit 120d are provided.

[Fourth Modification of the Sound Decoding Device of the Sixteenth Embodiment]

Fig. 235 is a diagram showing the configuration of a fourth modification 150D of the speech decoding device according to the sixteenth embodiment.

Fig. 236 is a flowchart showing the operation of the fourth modification 150D of the speech decoding device according to the sixteenth embodiment.

The difference between the present modification and the audio decoding device 150 according to the sixteenth embodiment is that the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d are provided with a high-frequency time envelope shape determining unit 120bA. The low frequency time envelope correcting unit 120e.

[Fifth Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 237 is a diagram showing the configuration of a fifth modification 150E of the speech decoding device according to the sixteenth embodiment.

Figure 238 is a flowchart showing the operation of a fifth modification 150E of the speech decoding device according to the sixteenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 120c, the high-frequency envelope correction unit 120d, the high-frequency envelope shape determining unit 120bA, and the low-frequency envelope correction unit 120e are provided.

[Sixth Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 239 is a diagram showing the configuration of a sixth modification 150F of the speech decoding device according to the sixteenth embodiment.

Fig. 240 is a flowchart showing the operation of the sixth modification 150F of the speech decoding device according to the sixteenth embodiment.

The difference between the present modification and the audio decoding device 150 according to the sixteenth embodiment is that the low-frequency envelope shape determining unit 100c and the high-frequency envelope shape determining unit 120b further include the time envelope shape determining unit 120f.

[Seventh Modification of Sound Decoding Device According to Sixteenth Embodiment]

Fig. 241 is a diagram showing the configuration of a seventh modification 150G of the speech decoding device according to the sixteenth embodiment.

Fig. 242 is a flowchart showing the operation of the seventh modification 150G of the speech decoding device according to the sixteenth embodiment.

The difference between the present modification and the first modification 150A of the audio decoding device according to the sixteenth embodiment is that the low-frequency time envelope shape determining unit 100c and the high-frequency time envelope correcting unit 110c are provided with a low-frequency time envelope. The shape determining unit 120c and the high-frequency time envelope correcting unit 120d.

[Eighth Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 243 is a diagram showing the configuration of an eighth modification 150H of the speech decoding device according to the sixteenth embodiment.

Figure 244 is a flowchart showing the operation of the eighth modification 150H of the speech decoding device according to the sixteenth embodiment.

The difference between the present modification and the first modification 150A of the audio decoding device according to the sixteenth embodiment is that the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d are provided with high-frequency time. The envelope shape determining unit 120bA and the low-frequency time envelope correcting unit 120e.

[Ninth Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 245 is a diagram showing the configuration of a ninth modification 150I of the speech decoding device according to the sixteenth embodiment.

Figure 246 is a flowchart showing the operation of the ninth modification 150I of the speech decoding device according to the sixteenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 120c, the high-frequency envelope correction unit 120d, the high-frequency envelope shape determining unit 120bA, and the low-frequency envelope correction unit 120e are provided.

[Tenth Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 247 is a diagram showing the configuration of a tenth modification 150J of the speech decoding device according to the sixteenth embodiment.

Fig. 248 is a flowchart showing the operation of the tenth modification 150J of the speech decoding device according to the sixteenth embodiment.

The present modification and the sound solution described in the sixteenth embodiment The difference between the first modification 150A of the code device is that the low-frequency envelope shape determining unit 100c and the high-frequency envelope shape determining unit 120b further include the time envelope shape determining unit 120f.

[Eleventh Modification of Sound Decoding Device According to Sixteenth Embodiment]

Fig. 249 is a diagram showing the configuration of an eleventh modification 150K of the speech decoding device according to the sixteenth embodiment.

Fig. 250 is a flowchart showing the operation of the eleventh modification 150K of the speech decoding device according to the sixteenth embodiment.

The difference between the present modification and the second modification 150B of the audio decoding device according to the sixteenth embodiment is that the low-frequency time envelope shape determining unit 100c and the high-frequency time envelope correcting unit 110c are provided with a low-frequency time envelope. The shape determining unit 120c and the high-frequency time envelope correcting unit 120d.

[Twelfth Modification of Sound Decoding Device According to Sixteenth Embodiment]

Fig. 251 is a diagram showing the configuration of a twelfth modification 150L of the speech decoding device according to the sixteenth embodiment.

Fig. 252 is a flowchart showing the operation of the twelfth modification 150L of the speech decoding device according to the sixteenth embodiment.

The difference between the present modification and the second modification 150B of the audio decoding device according to the sixteenth embodiment is that the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d are provided with high-frequency time. Envelope shape determining unit 120bA, low frequency time envelope correction Part 120e this point.

[Thirteen Modification of Sound Decoding Device According to Sixteenth Embodiment]

Fig. 253 is a diagram showing the configuration of a thirteenth modification 150M of the speech decoding device according to the sixteenth embodiment.

Figure 254 is a flowchart showing the operation of the thirteenth modification 150M of the speech decoding device according to the sixteenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 120c, the high-frequency envelope correction unit 120d, the high-frequency envelope shape determining unit 120bA, and the low-frequency envelope correction unit 120e are provided.

[Fourth Modification of Sound Decoding Device According to Sixteenth Embodiment]

Fig. 255 is a diagram showing the configuration of a fourteenth modification 150N of the speech decoding device according to the sixteenth embodiment.

Fig. 256 is a flowchart showing the operation of the fourteenth modification 150N of the speech decoding device according to the sixteenth embodiment.

The difference between the present modification and the second modification 150B of the audio decoding device according to the sixteenth embodiment is that the low-frequency envelope shape determining unit 100c and the high-frequency envelope shape determining unit 120b further have time envelope shape determination. Part 120f this point.

[17th embodiment]

Figure 106 is a diagram showing a sound decoding device 160 according to the seventeenth embodiment. An illustration of the composition. The communication device of the audio decoding device 160 receives the multiplexed code sequence output from the lower voice encoding device 260, and outputs the decoded audio signal to the outside. As shown in FIG. 106, the audio decoding device 160 is functionally provided with a code sequence inverse multiplexing unit 150a, a switch group 150b, a low frequency decoding unit 100b, a low frequency time envelope shape determining unit 100c, and a low frequency time envelope correcting unit. 100d, high-frequency time envelope shape determining unit 120b, high-frequency time envelope correcting unit 130a, high-frequency decoding unit 130b, and low-frequency/high-frequency signal synthesizing unit 150c.

Figure 107 is a flowchart showing the operation of the sound decoding device according to the seventeenth embodiment. Further, the order of the processes of steps S150-2 and S150-3 is not limited to the sequence of the flowchart of FIG. 107 as long as it is determined before the high-frequency time envelope shape and the high-frequency code portion decoding process. .

Fig. 108 is a diagram showing the configuration of the speech encoding device 260 according to the seventeenth embodiment. The communication device of the audio coding device 260 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 108, the voice encoding device 260 is provided with a high frequency signal generation control information encoding unit 250a, a low frequency encoding unit 200a, a high frequency encoding unit 200b, a low frequency time envelope information encoding unit 200c, and a high frequency. The time envelope information encoding unit 220a and the code sequence multiplexing unit 250b.

Figure 109 is a flowchart showing the operation of the speech encoding device 260 according to the seventeenth embodiment.

[First Modification of Sound Decoding Device According to Seventeenth Embodiment]

Fig. 110 is a diagram showing the configuration of a first modification 160A of the speech decoding device according to the seventeenth embodiment.

Fig. 111 is a flowchart showing the operation of the first modification 160A of the speech decoding device according to the seventeenth embodiment.

In contrast to the audio decoding device 160 of the embodiment, the high-frequency time envelope correction unit 130a is replaced with the high-frequency time envelope described in the first modification of the audio decoding device according to the fifteenth embodiment. This is the correction unit 140a.

Further, the order of the processes of steps S150-2 and S150-3 is not limited to the sequence of the flowchart of FIG. 111 as long as it is determined before the high-frequency time envelope shape and the high-frequency code portion decoding process. .

[Second Modification of Sound Decoding Device According to Seventeenth Embodiment]

Fig. 112 is a diagram showing the configuration of a second modification 170B of the speech decoding device according to the seventeenth embodiment.

The difference from the first modification 160A of the audio decoding device according to the embodiment is similar to the second modification of the audio decoding device according to the fifteenth embodiment, and the low-frequency/high-frequency signal synthesizing unit 150c is used for synthesizing processing. The low frequency signal is not the low frequency signal whose time envelope shape is corrected in the low frequency time envelope correction unit 100d, and is changed to the low frequency signal decoded by the low frequency decoding unit 100b.

[Third Modification of Sound Decoding Device According to Seventeenth Embodiment]

Figure 257 is a diagram showing the configuration of a third modification 160C of the speech decoding device according to the seventeenth embodiment.

Fig. 258 is a flowchart showing the operation of the third modification 160C of the speech decoding device according to the seventeenth embodiment.

In addition to the low-frequency time envelope shape determining unit 100c and the high-frequency time envelope correcting unit 130a, the low-frequency time envelope shape determining unit 120c is provided in addition to the low-frequency time envelope shape determining unit 100a and the high-frequency time envelope correcting unit 130a. The high frequency time envelope correcting unit 140b.

[Fourth Modification of Sound Decoding Device According to Seventeenth Embodiment]

Figure 259 is a diagram showing the configuration of a fourth modification 160D of the speech decoding device according to the seventeenth embodiment.

Figure 260 is a flowchart showing the operation of the fourth modification 160D of the speech decoding device according to the seventeenth embodiment.

In addition to the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d, the high-frequency time envelope shape determining unit 120bA is provided in addition to the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d. The low frequency time envelope correcting unit 120e.

[Fifth Modification of Sound Decoding Device According to Seventeenth Embodiment]

Figure 261 is a diagram showing the configuration of a fifth modification 160E of the speech decoding device according to the seventeenth embodiment.

Fig. 262 is a flowchart showing the operation of the fifth modification 160E of the speech decoding device according to the seventeenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 120c, the pre-recording high-frequency envelope correction unit 140b, the pre-recording high-frequency envelope shape determining unit 120bA, and the pre-recording low-frequency envelope correction unit 120e are provided.

[Sixth Modification of Sound Decoding Device According to Seventeenth Embodiment]

Figure 263 is a diagram showing the configuration of a sixth modification 160F of the speech decoding device according to the seventeenth embodiment.

Fig. 264 is a flowchart showing the operation of the sixth modification 160F of the speech decoding device according to the seventeenth embodiment.

The difference between the present modification and the audio decoding device 160 according to the seventeenth embodiment is that the low-frequency envelope shape determining unit 100c and the high-frequency envelope shape determining unit 120b further include the time envelope shape determining unit 120f.

[Seventh Modification of Sound Decoding Device According to Seventeenth Embodiment]

Figure 265 is a diagram showing the configuration of a seventh modification 160G of the speech decoding device according to the seventeenth embodiment.

Fig. 266 is a flowchart showing the operation of the seventh modification 160G of the speech decoding device according to the seventeenth embodiment.

The difference between the present modification and the first modification 160A of the voice decoding device according to the seventeenth embodiment is that the low frequency time packet is included. The network shape determining unit 100c and the high-frequency time envelope correcting unit 140a further include a low-frequency time envelope shape determining unit 120c and a high-frequency time envelope correcting unit 140b.

In the present modification, the high-frequency time envelope correcting unit 140b is based on the time envelope shape determined by the high-frequency time envelope shape determining unit 120b and the time envelope shape determined by the low-frequency time envelope shape determining unit 120c. At least one or more of them corrects the shape of the time envelope of the low-frequency signal whose time envelope shape has been corrected, which is input to the high-frequency decoding unit 130b (S140-2).

[Eighth Modification of Sound Decoding Device According to Seventeenth Embodiment]

Figure 267 is a diagram showing the configuration of an eighth modification 160H of the speech decoding device according to the seventeenth embodiment.

Figure 268 is a flowchart showing the operation of the eighth modification 160H of the speech decoding device according to the seventeenth embodiment.

The difference between the present modification and the first modification 160A of the audio decoding device according to the seventeenth embodiment is that the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d are provided with high-frequency time. The envelope shape determining unit 120bA and the low-frequency time envelope correcting unit 120e.

[Ninth Modification of Sound Decoding Device According to Seventeenth Embodiment]

Figure 269 is a diagram showing the configuration of a ninth modification 160I of the speech decoding device according to the seventeenth embodiment.

Figure 270 is a flowchart showing the operation of a ninth modification 160I of the speech decoding device according to the seventeenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 120c, the pre-recording high-frequency envelope correction unit 140b, the pre-recording high-frequency envelope shape determining unit 120bA, and the pre-recording low-frequency envelope correction unit 120e are provided.

[Tenth Modification of Sound Decoding Device According to Seventeenth Embodiment]

Figure 271 is a diagram showing the configuration of a tenth modification 160J of the speech decoding device according to the seventeenth embodiment.

Figure 272 is a flowchart showing the operation of the tenth modification 160J of the speech decoding device according to the seventeenth embodiment.

The difference between the present modification and the first modification 160A of the audio decoding device according to the seventeenth embodiment is that the low-frequency envelope shape determining unit 100c and the high-frequency envelope shape determining unit 120b further have time envelope shape determination. Part 120f this point.

[Eleventh Modification of Sound Decoding Device According to Seventeenth Embodiment]

Figure 273 is a diagram showing the configuration of an eleventh modification 160K of the speech decoding device according to the seventeenth embodiment.

Figure 274 is a flowchart showing the operation of the eleventh modification 160K of the speech decoding device according to the seventeenth embodiment.

The difference between the present modification and the second modification 160B of the voice decoding device according to the seventeenth embodiment is that the low frequency time packet is excluded. The network shape determining unit 100c and the high-frequency time envelope correcting unit 140a further include a low-frequency time envelope shape determining unit 120c and a high-frequency time envelope correcting unit 140b.

[Twelfth Modification of Sound Decoding Device According to Seventeenth Embodiment]

Figure 275 is a diagram showing the configuration of a twelfth modification 160L of the speech decoding device according to the seventeenth embodiment.

Fig. 276 is a flowchart showing the operation of the twelfth modification 160L of the speech decoding device according to the seventeenth embodiment.

The difference between the present modification and the second modification 160B of the audio decoding device according to the seventeenth embodiment is that the high-frequency time envelope shape determining unit 120b and the low-frequency time envelope correcting unit 100d are provided with high-frequency time. The envelope shape determining unit 120bA and the low-frequency time envelope correcting unit 120e.

[Thirteen Modification of Sound Decoding Device According to Seventeenth Embodiment]

Figure 277 is a diagram showing the configuration of a thirteenth modification 160M of the speech decoding device according to the seventeenth embodiment.

Figure 278 is a flowchart showing the operation of the thirteenth modification 160M of the speech decoding device according to the seventeenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 120c, the pre-recording high-frequency envelope correction unit 140b, the pre-recording high-frequency envelope shape determining unit 120bA, and the pre-recording low-frequency envelope correction unit 120e are provided.

[Fourth Modification of Sound Decoding Device According to Seventeenth Embodiment]

Figure 279 is a diagram showing the configuration of a fourteenth modification 160N of the speech decoding device according to the seventeenth embodiment.

Figure 280 is a flowchart showing the operation of the fourteenth modification 160N of the speech decoding device according to the seventeenth embodiment.

The difference between the present modification and the second modification 160B of the audio decoding device according to the seventeenth embodiment is that the low-frequency envelope shape determining unit 100c and the high-frequency envelope shape determining unit 120b further have time envelope shape determination. Part 120f this point.

[18th embodiment]

Figure 113 is a diagram showing the configuration of the sound decoding device 170 according to the eighteenth embodiment. The communication device of the audio decoding device 170 receives the multiplexed code sequence output from the lower voice encoding device 270, and outputs the decoded audio signal to the outside. As shown in FIG. 113, the audio decoding device 170 is functionally provided with a code sequence inverse multiplexing unit 170a, a switch group 170b, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analyzing unit 13c, and a low frequency. Time envelope shape determining unit 10e, low-frequency time envelope correcting unit 10f, high-frequency time envelope shape determining unit 13a, time envelope correcting unit 13b, high-frequency signal generating unit 10g, decoding/inverse quantization unit 10h, frequency envelope adjusting unit 10i, and The synthesis filter bank unit 170c.

Figure 114 is a sound decoding device according to an eighteenth embodiment. Flow chart of the action.

The code sequence inverse multiplexer 170a divides the code sequence into high frequency signal generation control information, a core code portion encoded by a low frequency signal, and information about a time envelope shape necessary for the low frequency time envelope shape determining portion 10e. (Step S170-1).

Based on the high frequency signal generation control information obtained by the encoding sequence inverse multiplexing unit 170a, it is determined whether or not a high frequency signal is generated (step S170-2).

To generate a high frequency signal, the code sequence inverse multiplexing unit 170a extracts a band extension portion for generating a high frequency signal from the low frequency signal from the code sequence, and the code sequence analysis unit 13c reverses the coded sequence. The band extension portion of the code sequence extracted by the multiplexer 170a is analyzed and divided into the high frequency signal generation unit 10g and the information necessary for the decoding/inverse quantization unit 10h, and necessary for the high frequency time envelope shape determining unit 13a. Information about the shape of the time envelope (step S170-3). Then, the high frequency encoding portion of the encoding sequence is used to generate a high frequency signal, and then the time envelope shape of the high frequency signal is determined, and the time envelope shape of the high frequency signal is corrected.

In addition, the order of the processing of steps S170-2 and S170-3 is not limited to the map 114 as long as the determination of the temporal envelope shape of the high-frequency signal and the decoding and inverse quantization of the band extension portion are performed. The sequence of the flow chart.

The synthesis filter bank unit 170c determines that a high frequency signal is to be generated based on the high frequency signal generation information, and then the time envelope is formed. The corrected low frequency sub-band signal and the time envelope shape have been corrected by the high frequency sub-band signal to synthesize the output audio signal. If it is determined that the high frequency signal is not generated according to the pre-recorded high-frequency signal generation information, then the time envelope is obtained. The low frequency sub-band signal whose shape has been corrected is combined to output an audio signal (step S170-4).

In the low-frequency envelope shape determining unit 10e of the audio decoding device 170 according to the present embodiment, the first, second, and third modified examples of the audio decoding device according to the first embodiment of the present invention can be applied. No doubt.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 170 according to the present embodiment, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. The first modification of the sound decoding device according to the seventh embodiment of the present invention is unquestionable.

Figure 115 is a diagram showing the configuration of the speech encoding device 270 according to the eighteenth embodiment. The communication device of the speech encoding device 270 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 115, the speech encoding device 270 is functionally provided with a high-frequency signal generation control information encoding unit 270a, a down-conversion sampling unit 20a, a core encoding unit 20b, and analysis filter group units 20c and 20c1. The parameter encoding unit 20d, the envelope calculation unit 20e, the quantization/encoding unit 20f, the core decoding signal generation unit 20i, the sub-band signal power calculation unit 20j, the time envelope information coding unit 270b, and the code sequence multiplexing unit 270c.

Figure 116 is a flowchart showing the operation of the speech encoding device 270 according to the eighteenth embodiment.

The high-frequency signal generation control information encoding unit 270a determines whether to generate a high-frequency signal based on at least one of the input audio signal and the high-frequency signal generation control instruction signal, and encodes the high-frequency signal generation control information (step S270- 1). For example, if the input audio signal is a signal including a frequency band generated in the frequency band expansion of quantization and coding performed by the quantization/encoding unit 20f, it is determined that a high frequency signal is to be generated. Then, for example, if the high frequency signal is generated by the high frequency signal generation control instruction signal, it is determined that the high frequency signal is to be generated. Then, for example, the two methods described above may be combined. For example, when one of the two methods is previously determined to determine that a high frequency signal is to be generated, it is determined that a high frequency signal is to be generated.

The high-frequency signal generation control information can be encoded, for example, by indicating whether or not to generate a high-frequency signal.

However, there is no limitation on whether or not to generate a high-frequency signal and a method of encoding the high-frequency signal generation control information.

When the high-frequency signal generation control information encoding unit 270a determines that a high-frequency signal is to be generated, the information necessary for generating a high-frequency signal by band expansion is calculated and encoded. On the other hand, when the high-frequency signal generation control information encoding unit 270a determines that the high-frequency signal is not to be generated, the calculation and encoding of the information necessary for the generation of the high-frequency signal are not performed (step S270-2).

The time envelope information encoding unit 270b is in the high frequency signal When the generation control information encoding unit 270a determines that the high frequency signal is to be generated, at least one of the time envelope of the low frequency signal and the time envelope of the high frequency signal is calculated, and then the calculated by the subband signal power calculation unit 20j is used. The power of the sub-band signal of the core decoding signal is used to calculate the time envelope of the core decoding signal, and the time envelope is based on the time envelope of the low-frequency signal and the time envelope of the high-frequency signal and the time envelope of the core decoding signal. Information is encoded. The time envelope information contains low frequency time envelope information and high frequency time envelope information. Similarly to the operation of the time envelope information encoding unit 26a of the speech encoding device 26 of the seventh embodiment, the encoding method of the low frequency time envelope information and the high frequency time envelope information is not limited. On the other hand, when the high-frequency signal generation control information encoding unit 270a determines that the high-frequency signal is not to be generated, the time envelope of the low-frequency signal is calculated, and the core decoded signal calculated by the sub-band signal power calculation unit 20j is used. The power of the frequency band signal is used to calculate the time envelope of the core decoded signal, and the time envelope information about the low frequency signal is encoded according to the time envelope of the low frequency signal and the time envelope of the core decoded signal (step S270-3). Here, when the high-frequency signal generation control information encoding unit 270a determines that the high-frequency signal is not to be generated, the envelope calculation unit 270d can calculate only the power of the sub-band signal of the low-frequency signal, or even the sub-band of the low-frequency signal. The sub-band signal of the low-frequency signal is sent to the time envelope information encoding unit 270b for the power of the signal. If the power of the sub-band signal of the low-frequency signal is not calculated, the power of the sub-band signal of the low-frequency signal can be calculated in the time envelope information encoding unit 270b, and the power of the sub-band signal of the low-frequency signal is calculated. Come, there is no limit.

The code sequence multiplexer 270c receives the encoded high frequency signal generation control information from the high frequency signal generation control information encoding unit 270a, and receives the code sequence of the low frequency signal from the core encoding unit 20b, and the time envelope information encoding unit 20g. When the high-frequency signal generation control information encoding unit 270a determines that the high-frequency signal is to be generated, the control parameter encoding unit 20d also receives the encoded control parameter, and also from the quantization/ The encoding unit 20f receives the gain of the high-frequency signal that has been encoded and the size of the noise signal, and multiplexes them into a code sequence and outputs them (step S270-4).

[First Modification of Sound Decoding Device According to Eighteenth Embodiment]

Fig. 281 is a diagram showing the configuration of a first modification 170A of the speech decoding device according to the eighteenth embodiment.

Figure 282 is a flowchart showing the operation of the first modification 170A of the speech decoding device according to the eighteenth embodiment.

The difference between the present modification and the audio decoding device 170 according to the eighteenth embodiment is that the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the time envelope correcting unit 13b are provided. The low-frequency time envelope shape determining unit 16b and the time envelope correcting unit 16c are provided.

[Second Modification of Sound Decoding Device According to Eighteenth Embodiment]

Figure 283 is the second aspect of the voice decoding device according to the eighteenth embodiment. Illustration of the configuration of the modification 170B.

Figure 284 is a flowchart showing the operation of the second modification 170B of the speech decoding device according to the eighteenth embodiment.

The difference between the present modification and the audio decoding device 170 according to the eighteenth embodiment is other than the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) and the low-frequency time envelope correcting unit 10f. Further, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[Third Modification of Sound Decoding Device According to Eighteenth Embodiment]

Figure 285 is a diagram showing the configuration of a third modification 170C of the speech decoding device according to the eighteenth embodiment.

Figure 286 is a flowchart showing the operation of a third modification 170C of the speech decoding device according to the eighteenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 16c, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Fourth Modification of Sound Decoding Device According to Eighteenth Embodiment]

Figure 287 is a diagram showing the configuration of a fourth modification 170D of the speech decoding device according to the eighteenth embodiment.

Figure 288 is a flowchart showing the operation of the fourth modification 170D of the speech decoding device according to the eighteenth embodiment.

In addition to the low-frequency time envelope shape determining unit 10e and the high-frequency time envelope shape determining unit 13a, the time difference envelope determining unit 16f is provided in addition to the low-frequency time envelope shape determining unit 10e and the high-frequency time envelope shape determining unit 13a. point.

[19th embodiment]

Figure 117 is a diagram showing the configuration of the sound decoding device 180 according to the nineteenth embodiment. The communication device of the audio decoding device 180 receives the multiplexed code sequence output from the lower voice encoding device 280, and outputs the decoded audio signal to the outside. As shown in FIG. 117, the audio decoding device 180 is functionally provided with a code sequence inverse multiplexing unit 170a, a switch group 170b, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analyzing unit 13c, and a low frequency. Time envelope shape determining unit 10e, low-frequency time envelope correcting unit 10f, high-frequency time envelope shape determining unit 13a, high-frequency signal generating unit 10g, time envelope correcting unit 14a, decoding/inverse quantization unit 10h, frequency envelope adjusting unit 10i, and The synthesis filter bank unit 170c.

Figure 118 is a flowchart showing the operation of the sound decoding device according to the nineteenth embodiment. Further, the order of the processing of steps S170-2 and S170-3 is not limited to the map 118 as long as the determination of the temporal envelope shape of the high-frequency signal and the decoding and inverse quantization of the band extension portion are performed. The sequence of the flow chart.

Further, the low-frequency envelope shape determining unit 10e of the sound decoding device 180 according to the present embodiment can be applied to the first aspect of the present invention. The first, second, and third modifications of the audio decoding device according to the first embodiment should be unquestioned.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 180 according to the present embodiment, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. The first modification of the audio decoding device according to the fifth embodiment of the present invention and the first modification of the audio decoding device according to the seventh embodiment of the present invention are unquestionable.

Figure 119 is a diagram showing the configuration of a voice encoding device 280 according to the nineteenth embodiment. The communication device of the speech encoding device 280 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 119, the speech encoding device 280 is functionally provided with a high-frequency signal generation control information encoding unit 270a, a down-conversion sampling unit 20a, a core encoding unit 20b, and analysis filter group units 20c and 20c1. Parameter encoding unit 20d, envelope calculation unit 270d, quantization/encoding unit 20f, core decoding signal generating unit 20i, sub-band signal power calculating units 20j and 24b, pseudo-high-frequency signal generating unit 24a, time envelope information encoding unit 280a, and encoding The sequence multiplexing unit 270c.

Figure 120 is a flowchart showing the operation of the speech encoding device 280 according to the nineteenth embodiment.

When the high-frequency signal generation control information encoding unit 270a determines that a high-frequency signal is to be generated, the information necessary for generating a high-frequency signal by band expansion is calculated, encoded, and then a pseudo-high is generated. The frequency signal and calculate the time envelope that should be like a high frequency signal. On the other hand, when the high-frequency signal generation control information encoding unit 270a determines that the high-frequency signal is not to be generated, the calculation, encoding, and pre-recording of the information necessary for generating the high-frequency signal by the pre-band expansion are not performed. The generation of the high frequency signal and the calculation of the time envelope are simulated (step S280-1).

When the high-frequency signal generation control information encoding unit 270a determines that a high-frequency signal is to be generated, the time envelope information encoding unit 280a converts the time envelope of the low-frequency signal of the input audio signal, the time envelope of the high-frequency signal, and the core decoding. At least one or more of the time envelope of the signal and the time envelope of the pseudo-high frequency signal are calculated, and the time envelope information is encoded according to the calculated time envelope. The time envelope information contains low frequency time envelope information and high frequency time envelope information. Similarly to the operation of the time envelope information encoding unit 26a of the speech encoding device 26 of the seventh embodiment, the encoding method of the low frequency time envelope information and the high frequency time envelope information is not limited. On the other hand, when the high-frequency signal generation control information encoding unit 270a determines that the high-frequency signal is not to be generated, at least one of the time envelope of the low-frequency signal of the audio signal and the time envelope of the core decoding signal is input. It is calculated that the time envelope information about the low frequency signal is encoded based on the calculated time envelope (step S280-2).

Further, the first modification of the speech encoding device according to the seventh embodiment of the present invention is applicable to the speech encoding device 280 according to the present embodiment, and it is needless to say that there is no doubt.

[First Modification of Sound Decoding Device According to the 19th Embodiment]

Figure 289 is a diagram showing the configuration of a first modification 180A of the speech decoding device according to the nineteenth embodiment.

Figure 290 is a flowchart showing the operation of the first modification 180A of the speech decoding device according to the nineteenth embodiment.

The difference between the present modification and the audio decoding device 180 according to the nineteenth embodiment is that the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the time envelope correcting unit 14a are provided. The low-frequency time envelope shape determining unit 16b and the time envelope correcting unit 17a are provided.

[Second Modification of Sound Decoding Device According to the 19th Embodiment]

Figure 291 is a diagram showing the configuration of a second modification 180B of the speech decoding device according to the nineteenth embodiment.

Figure 292 is a flowchart showing the operation of the second modification 180B of the speech decoding device according to the nineteenth embodiment.

The difference between the present modification and the audio decoding device 180 according to the nineteenth embodiment is that the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) and the low-frequency time envelope correcting unit 10f may be used. Further, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[Third Modification of Sound Decoding Device According to the Ninth Embodiment]

Figure 293 is a third aspect of the voice decoding device according to the nineteenth embodiment. Illustration of the configuration of the modification 180C.

Figure 294 is a flowchart showing the operation of the third modification 180C of the speech decoding device according to the nineteenth embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 17a, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Fourth Modification of the Sound Decoding Device of the 19th Embodiment]

Figure 295 is a diagram showing the configuration of a fourth modification 180D of the speech decoding device according to the nineteenth embodiment.

Figure 296 is a flowchart showing the operation of the fourth modification 180D of the speech decoding device according to the nineteenth embodiment.

The difference between the present modification and the audio decoding device 180 according to the nineteenth embodiment is that the low-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a include a time envelope shape determining unit 16f. point.

[Twentyth embodiment]

Fig. 121 is a diagram showing the configuration of the sound decoding device 190 according to the twentieth embodiment. The communication device of the audio decoding device 190 receives the multiplexed code sequence output from the lower voice encoding device 290, and outputs the decoded audio signal to the outside. The sound decoding device 190, as shown in FIG. 121, is functionally provided with: a coding sequence inverse Multiplexing unit 170a, switch group 170b, core decoding unit 10b, analysis filter group unit 10c, code sequence analysis unit 13c, low-frequency time envelope shape determining unit 10e, low-frequency time envelope correcting unit 10f, and high-frequency time envelope shape determining unit 13a, high frequency signal generating unit 10g, decoding/inverse quantization unit 10h, frequency envelope adjusting unit 10i, time envelope correcting unit 15a, and synthesis filter bank unit 170c.

Figure 122 is a flowchart showing the operation of the sound decoding device according to the twentieth embodiment. In addition, the order of the processing of steps S170-2 and S170-3 may be performed before the determination of the temporal envelope shape of the high-frequency signal and the decoding and inverse quantization of the band extension portion, and is not limited to FIG. 122. The sequence of the flow chart.

In addition, the first, second, and third modifications of the audio decoding device according to the first embodiment of the present invention are applicable to the low-frequency time envelope shape determining unit 10e of the audio decoding device 190 according to the present embodiment. No doubt.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 190 according to the present embodiment, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. The first modification of the audio decoding device according to the fifth embodiment of the present invention and the first modification of the audio decoding device according to the seventh embodiment of the present invention are unquestionable.

Figure 123 is a diagram showing the configuration of the speech encoding device 290 according to the twentieth embodiment. The communication device of the voice encoding device 290 receives the voice signal as the encoding target from the outside, and The encoded code sequence is output to the outside. As shown in FIG. 123, the speech encoding device 290 is functionally provided with a high-frequency signal generation control information encoding unit 270a, a down-conversion sampling unit 20a, a core encoding unit 20b, and analysis filter group units 20c and 20c1. Parameter encoding unit 20d, envelope calculation unit 270d, quantization/encoding unit 20f, core decoding signal generating unit 20i, sub-band signal power calculating units 20j and 24b, pseudo-high-frequency signal generating unit 24a, time envelope information encoding unit 280a, and encoding The sequence multiplexing unit 270c.

Figure 124 is a flowchart showing the operation of the speech encoding device 290 according to the twentieth embodiment.

When the high-frequency signal generation control information encoding unit 270a determines that a high-frequency signal is to be generated, the time envelope information encoding unit 290a converts the time envelope of the low-frequency signal of the input audio signal, the time envelope of the high-frequency signal, and the core decoding. At least one or more of the time envelope of the signal and the time envelope of the pseudo-high frequency signal that has been adjusted by the frequency envelope are calculated, and the time envelope information is encoded based on the calculated time envelope. The time envelope information contains low frequency time envelope information and high frequency time envelope information. Similarly to the operation of the time envelope information encoding unit 26a of the speech encoding device 26 of the seventh embodiment, the encoding method of the low frequency time envelope information and the high frequency time envelope information is not limited.

On the other hand, when the high-frequency signal generation control information encoding unit 270a determines that the high-frequency signal is not to be generated, at least one of the time envelope of the low-frequency signal of the audio signal and the time envelope of the core decoding signal is input. Calculated, based on the time envelope that has been calculated, will be low The time envelope information of the frequency signal is encoded (step S290-1).

Further, the first modification of the speech encoding device according to the seventh embodiment of the present invention is applicable to the speech encoding device 290 according to the present embodiment, and it is needless to say that there is no doubt.

[First Modification of the Sound Decoding Device of the 20th Embodiment]

Figure 297 is a diagram showing the configuration of a first modification 190A of the speech decoding device according to the twentieth embodiment.

Figure 298 is a flowchart showing the operation of the first modification 190A of the speech decoding device according to the twentieth embodiment.

The difference between the present modification and the audio decoding device 190 according to the twentieth embodiment is that the time envelope correction unit 15a is provided in addition to the time envelope correction unit 13a.

[Second Modification of the Sound Decoding Device of the 20th Embodiment]

Figure 299 is a diagram showing the configuration of a second modification 190B of the speech decoding device according to the twentieth embodiment.

Fig. 300 is a flowchart showing the operation of the second modification 190B of the speech decoding device according to the twentieth embodiment.

The difference between the present modification and the audio decoding device 190 according to the twentieth embodiment is that the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the time envelope correcting unit 15a are provided. The low-frequency time envelope shape determining unit 16b and the time envelope correcting unit 18a are provided.

[Third Modification of Sound Decoding Device According to Twentieth Embodiment]

Figure 301 is a diagram showing the configuration of a third modification 190C of the speech decoding device according to the twentieth embodiment.

Fig. 302 is a flowchart showing the operation of a third modification 190C of the speech decoding device according to the twentieth embodiment.

The difference between the present modification and the audio decoding device 190 according to the twentieth embodiment is that the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) and the low-frequency time envelope correcting unit 10f may be used. Further, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[Fourth Modification of the Sound Decoding Device of the 20th Embodiment]

Figure 303 is a diagram showing the configuration of a fourth modification 190D of the speech decoding device according to the twentieth embodiment.

Fig. 304 is a flowchart showing the operation of the fourth modification 190D of the speech decoding device according to the twentieth embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 18a, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Fifth Modification of the Sound Decoding Device According to the 20th Embodiment]

Figure 305 is a fifth aspect of the sound decoding device according to the twentieth embodiment. Illustration of the configuration of the modification 190E.

Figure 306 is a flowchart showing the operation of a fifth modification 190E of the speech decoding device according to the twentieth embodiment.

The difference between the present modification and the audio decoding device 190 according to the twentieth embodiment of the present invention is that the time envelope shape determining unit 16f is provided in addition to the low-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a. point.

[Sixth Modification of the Sound Decoding Device of the 20th Embodiment]

Figure 307 is a diagram showing the configuration of a sixth modification 190F of the speech decoding device according to the twentieth embodiment.

Figure 308 is a flowchart showing the operation of the sixth modification 190F of the speech decoding device according to the twentieth embodiment.

The present modification and the first modification of the twentieth embodiment In addition to the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the time envelope correcting unit 15aA, the sound decoding device 190A includes a low-frequency time envelope shape determining unit 16b and time. The envelope correction unit 18aA is the same.

[Seventh Modification of Sound Decoding Device According to Twentieth Embodiment]

Figure 309 is a diagram showing the configuration of a seventh modification 190G of the speech decoding device according to the twentieth embodiment.

Figure 310 is a flowchart showing the operation of a seventh modification 190G of the speech decoding device according to the twentieth embodiment.

The difference between the present modification and the audio decoding device 190A according to the first modification of the twentieth embodiment is that the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) may be used. In addition to the envelope correcting unit 10f, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[8th Modification of the Sound Decoding Device According to the 20th Embodiment]

Figure 311 is a diagram showing the configuration of an eighth modification 190H of the speech decoding device according to the twentieth embodiment.

Figure 312 is a flowchart showing the operation of an eighth modification 190H of the speech decoding device according to the twentieth embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 18aA, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Ninth Modification of Sound Decoding Device According to Twentieth Embodiment]

Figure 313 is a diagram showing the configuration of a ninth modification 190I of the speech decoding device according to the twentieth embodiment.

Figure 314 is a flowchart showing the operation of a ninth modification 190I of the speech decoding device according to the twentieth embodiment.

The difference between the present modification and the audio decoding device 190A according to the first modification of the twentieth embodiment is that the low-frequency time envelope shape determining unit 10e and the high-frequency time envelope shape determining unit 13a are included. Further, the time envelope shape determining unit 16f is provided.

[21st embodiment]

Fig. 125 is a view showing the configuration of the sound decoding device 300 according to the twenty first embodiment. The communication device of the audio decoding device 300 receives the multiplexed code sequence output from the lower voice encoding device 400, and outputs the decoded audio signal to the outside. As shown in FIG. 125, the audio decoding device 300 is functionally provided with a code sequence inverse multiplexing unit 10a, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analysis unit 13c, and a low-frequency time envelope shape determination. Part 10e, low-frequency time envelope correction unit 10f, high-frequency time envelope shape determination unit 13a, time envelope correction unit 300a, high-frequency signal generation unit 10g, decoding/inverse quantization unit 10h, frequency envelope adjustment unit 10i, and synthesis filter bank Department 10j.

Figure 126 is a flowchart showing the operation of the speech decoding apparatus according to the twenty-first embodiment.

The time envelope correction unit 300a is based on the time envelope shape determined by the high-frequency time envelope shape determining unit 13a, and is generated from the low-frequency time envelope correcting unit 10f and generated by the high-frequency signal generating unit 10g. The shape of the time envelope of the complex sub-band signal of the low-frequency signal whose time envelope shape has been used is corrected (step S300-1). The difference from the time envelope correction unit 13b is that the input signal is not the complex sub-band signal of the low-frequency signal output from the analysis filter bank unit 10c, and is changed to the time output from the low-frequency time envelope correction unit 10f. Envelope shape has been corrected for the low frequency signal of the complex sub-band signal point. In the time envelope correction processing in the time envelope correcting unit 13b, the complex sub-band signal of the low-frequency signal output from the analysis filter group unit 10c is changed to the time envelope output from the low-frequency time envelope correcting unit 10f. The complex sub-band signal of the low-frequency signal whose shape has been corrected can be realized.

In addition, the first, second, and third modifications of the audio decoding device according to the first embodiment of the present invention are applicable to the low-frequency envelope shape determining unit 10e of the audio decoding device 300 according to the present embodiment. No doubt.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 300 according to the present embodiment, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. The first modification of the sound decoding device according to the seventh embodiment of the present invention is unquestionable.

Figure 127 is a diagram showing the configuration of the speech encoding device 400 according to the twenty-first embodiment. The communication device of the speech encoding device 400 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 127, the speech encoding device 400 is provided with a downsampling unit 20a, a core encoding unit 20b, analysis filter group units 20c and 20c1, a control parameter encoding unit 20d, and an envelope calculation unit 20e. The quantization/encoding unit 20f, the core decoding signal generating unit 20i, the sub-band signal power calculating unit 20j, the time envelope information encoding unit 400a, and the code sequence multiplexing unit 20h.

Figure 128 is a sound encoding device according to a twenty-first embodiment Flow chart of the action of 400.

The time envelope information encoding unit 400a calculates at least one of a time envelope of the low frequency signal and a time envelope of the high frequency signal, and then uses the power of the subband signal of the core decoded signal calculated by the subband signal power calculation unit 20j. Calculating a time envelope of the core decoding signal, and encoding the time envelope information according to the time envelope of the time envelope of the low frequency signal and the time envelope of the high frequency signal and the time envelope of the core decoding signal (step S400-1) . The time envelope information contains low frequency time envelope information and high frequency time envelope information. Similarly to the operation of the time envelope information encoding unit 26a of the speech encoding device 26 of the seventh embodiment, the encoding method of the low frequency time envelope information and the high frequency time envelope information is not limited. The difference from the time envelope information encoding unit 26a is that when calculating the time envelope information about the high frequency signal, at least one of a time envelope using the core decoded signal and time envelope information about the low frequency signal can be used. To correct the time envelope of the core decoded signal of the time envelope shape. In addition, the time envelope shape of the high frequency signal can be generated based on the time envelope information of the low frequency signal.

[First Modification of Sound Decoding Device According to 21st Embodiment]

Figure 315 is a diagram showing the configuration of a first modification 300A of the speech decoding device according to the twenty-first embodiment.

Fig. 316 is a flowchart showing the operation of the first modification 300A of the speech decoding device according to the twenty-first embodiment.

The sound decoding device according to the twenty-first embodiment of the present modification The low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the time envelope correcting unit 300a include a low-frequency time envelope shape determining unit 16b and a time envelope correcting unit. 300aA this point.

In the present modification, the difference between the temporal envelope correcting unit 300aA and the preceding time envelope correcting unit 300a is based on the time envelope received from the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, 13aB). At least one of the shape and the time envelope shape received from the low-frequency time envelope shape determining unit 16b is used for generating the high-frequency signal from the low-frequency time envelope correcting unit 10f and generated by the high-frequency signal generating unit 10g. The time envelope shape is corrected by the shape of the time envelope of the complex sub-band signal of the low-frequency signal, and this is corrected (S300-1a).

[Second Modification of Sound Decoding Device According to 21st Embodiment]

Figure 317 is a diagram showing the configuration of a second modification 300B of the speech decoding device according to the twenty-first embodiment.

Figure 318 is a flowchart showing the operation of the second modification 300B of the speech decoding device according to the twenty-first embodiment.

The difference between the present modification and the audio decoding device 300 according to the twenty-first embodiment is that the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) and the low-frequency time envelope correcting unit 10f may be used. Further, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[Third Modification of Sound Decoding Device According to 21st Embodiment]

Fig. 319 is a diagram showing the configuration of a third modification 300C of the speech decoding device according to the twenty-first embodiment.

Fig. 320 is a flowchart showing the operation of the third modification 300C of the speech decoding device according to the twenty-first embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 300aA, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Fourth Modification of the Sound Decoding Device of the 21st Embodiment]

Fig. 321 is a diagram showing the configuration of a fourth modification 300D of the speech decoding device according to the twenty-first embodiment.

Fig. 322 is a flowchart showing the operation of the fourth modification 300D of the speech decoding device according to the twenty-first embodiment.

The difference between the present modification and the audio decoding device 300 according to the twenty-first embodiment is that the low-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a include a time envelope shape determining unit 16f. point.

[Twenty-second embodiment]

Figure 129 is a diagram showing the configuration of the audio decoding device 310 according to the twenty-second embodiment. The communication device of the sound decoding device 310 is connected to the multiplexed code sequence output from the lower voice encoding device 410. Receive, and then output the decoded audio signal to the outside. As shown in FIG. 129, the audio decoding device 310 is functionally provided with a coded sequence inverse multiplexing unit 10a, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analyzing unit 13c, and a low-frequency time envelope shape determination. Part 10e, low-frequency time envelope correction unit 10f, high-frequency time envelope shape determination unit 13a, high-frequency signal generation unit 10g, time envelope correction unit 14a, decoding/inverse quantization unit 10h, frequency envelope adjustment unit 10i, and synthesis filter bank Department 10j.

Figure 130 is a flowchart showing the operation of the sound decoding device according to the twenty-second embodiment.

The difference from the audio decoding device 17 according to the eighth embodiment of the present invention is that the high-frequency signal generating unit 10g does not use the complex sub-band signal of the low-frequency signal output from the analysis filter bank unit 10c, and uses the slave signal. The low-frequency time envelope correcting unit 10f outputs a complex sub-band signal of the low-frequency signal whose time envelope shape has been corrected to generate a high-frequency signal.

In addition, the first, second, and third modifications of the audio decoding device according to the first embodiment of the present invention are applicable to the low-frequency time envelope shape determining unit 10e of the audio decoding device 310 according to the present embodiment. No doubt.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 310 according to the present embodiment, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. The first modification of the audio decoding device according to the fifth embodiment of the present invention and the first modification of the audio decoding device according to the seventh embodiment of the present invention are unquestionable.

Figure 131 is a diagram showing the configuration of the speech encoding device 410 according to the nineteenth embodiment. The communication device of the speech encoding device 410 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 131, the speech encoding device 410 is functionally provided with a down-sampling unit 20a, a core encoding unit 20b, analysis filter group units 20c and 20c1, a control parameter encoding unit 20d, and an envelope calculation unit 270d. The quantization/encoding unit 20f, the core decoding signal generating unit 20i, the sub-band signal power calculating units 20j and 24b, the pseudo-high-frequency signal generating unit 410b, the time envelope information encoding unit 410a, and the code sequence multiplexing unit 270c.

Figure 132 is a flowchart showing the operation of the speech encoding device 410 according to the twenty-second embodiment.

The time envelope information encoding unit 410a calculates at least one of a time envelope of a low frequency signal input to the audio signal and a time envelope of the core decoded signal, and calculates a time envelope of the low frequency signal based on the calculated time envelope. The information is encoded (step S410-1).

The pseudo-high-frequency signal generating unit 410b is based on the sub-band signal of the low-frequency signal of the input audio signal obtained by the analysis filter group unit 20c, and the control parameters necessary for generating the high-frequency signal obtained by the control parameter encoding unit 20d. A pseudo high frequency signal is generated (step S410-2). The difference from the pseudo-high-frequency signal generating unit 24a is that, when the pseudo-high frequency signal is generated, the time envelope information about the low-frequency signal encoded by the time envelope information encoding unit 410a can be used to correct the analysis filter. Sub-band signal of the low-frequency signal of the input audio signal obtained on the group part 20c point.

The time envelope information encoding unit 410a calculates at least one of a time envelope of a high-frequency signal input to the audio signal and a time envelope of the pseudo-high-frequency signal, and calculates a high-frequency signal based on the calculated time envelope. The time envelope information is encoded (step S410-3).

In addition, the time envelope information encoding unit 410a may output the time envelope information about the low frequency signal and the time envelope information about the high frequency signal in the encoded sequence respectively encoded, or may use the time envelope information about the low frequency signal. The time envelope information about the high frequency signal is outputted together with the coding sequence encoded therein, and the form of the coding sequence of the time envelope information is not limited in the present invention. Further, similarly to the operation of the time envelope information encoding unit 26a of the speech encoding device 26 of the seventh embodiment, the encoding method of the low frequency time envelope information and the high frequency time envelope information is not limited.

Further, when the pseudo-high frequency signal generating unit 410b generates the pseudo-high frequency signal, and the time envelope information about the low frequency signal encoded by the time envelope information encoding unit 410a is not used, the time envelope information encoding unit 410a The processing of steps S410-1 and S410-3 can be implemented together. For example, similarly to the time envelope information encoding unit 27a, at least one of a time envelope of a low frequency signal input to the audio signal, a time envelope of the high frequency signal, a time envelope of the core decoded signal, and a time envelope of the pseudo high frequency signal is used. To calculate, the time envelope information can be encoded according to the time envelope that has been calculated.

Further, the voice encoding device according to the embodiment 410. A first modification of the speech encoding device according to the seventh embodiment of the present invention can be applied without any doubt. Moreover, the time envelope shape of the high frequency signal can be generated based on the time envelope information of the low frequency signal.

[First Modification of the Sound Decoding Device of the 22nd Embodiment]

Figure 323 is a diagram showing the configuration of a first modification 310A of the speech decoding device according to the twenty-second embodiment.

324 is a flowchart showing the operation of the first modification 310A of the speech decoding device according to the twenty-second embodiment.

The difference between the present modification and the audio decoding device 310 according to the twenty-second embodiment is that the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the time envelope correcting unit 14a are provided. The low-frequency time envelope shape determining unit 16b and the time envelope correcting unit 17a are provided.

[Second Modification of Sound Decoding Device of the 22nd Embodiment]

Figure 325 is a diagram showing the configuration of a second modification 310B of the speech decoding device according to the twenty-second embodiment.

Figure 326 is a flowchart showing the operation of the second modification 310B of the speech decoding device according to the twenty-second embodiment.

The difference between the present modification and the audio decoding device 310 according to the twenty-second embodiment is that the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) and the low-frequency time envelope correcting unit 10f may be used. , also has a high frequency time envelope shape determining unit 16d, low The frequency time envelope correcting unit 16e.

[Third Modification of Sound Decoding Device According to Twenty-First Embodiment]

Figure 327 is a diagram showing the configuration of a third modification 310C of the speech decoding device according to the twenty-second embodiment.

Figure 328 is a flowchart showing the operation of the third modification 310C of the speech decoding device according to the twenty-second embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 17a, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Fourth Modification of the Sound Decoding Device of the 22nd Embodiment]

Figure 329 is a diagram showing the configuration of a fourth modification 310D of the speech decoding device according to the twenty-second embodiment.

Figure 330 is a flowchart showing the operation of the fourth modification 310D of the speech decoding device according to the twenty-second embodiment.

The difference between the present modification and the audio decoding device 310 according to the twenty-second embodiment is that the low-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a include the time envelope shape determining unit 16f. point.

[23rd embodiment]

Figure 133 is a diagram showing a sound decoding device 320 according to the twenty-third embodiment. An illustration of the composition. The communication device of the audio decoding device 320 receives the multiplexed code sequence output from the lower voice encoding device 420, and outputs the decoded audio signal to the outside. As shown in FIG. 133, the audio decoding device 320 is functionally provided with a code sequence inverse multiplexing unit 10a, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analysis unit 13c, and a low-frequency time envelope shape determination. Part 10e, low-frequency time envelope correction unit 10f, high-frequency signal generation unit 10g, decoding/inverse quantization unit 10h, frequency envelope adjustment unit 10i, high-frequency time envelope shape determination unit 13a, time envelope correction unit 14a, and synthesis filter bank Department 10j.

Figure 134 is a flowchart showing the operation of the speech decoding apparatus according to the twenty-third embodiment.

The difference from the voice decoding device 18 of the ninth embodiment is that the high-frequency signal generating unit 10g does not use the complex sub-band signal of the low-frequency signal output from the analysis filter bank unit 10c, and uses the low-frequency signal instead. The time envelope shape output unit 10f outputs a complex sub-band signal of the low-frequency signal whose shape has been corrected to generate a high-frequency signal.

In the low-frequency envelope shape determining unit 10e of the audio decoding device 320 according to the present embodiment, the first, second, and third modified examples of the audio decoding device according to the first embodiment of the present invention can be applied. No doubt.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 320 according to the present embodiment, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. A first modification of the voice decoding device according to the fifth embodiment of the present invention, and The first modification of the speech decoding device according to the seventh embodiment of the present invention is unquestionable.

Figure 135 is a diagram showing the configuration of the speech encoding device 420 according to the twenty-third embodiment. The communication device of the speech encoding device 420 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 135, the voice encoding device 420 is functionally provided with a down-sampling unit 20a, a core encoding unit 20b, analysis filter group units 20c and 20c1, a control parameter encoding unit 20d, and an envelope calculation unit 20e. The quantization/encoding unit 20f, the pseudo-high-frequency signal generating unit 410b, the frequency envelope adjusting unit 25a, the core decoding signal generating unit 20i, the sub-band signal power calculating units 20j and 24b, the time envelope information encoding unit 420a, and the coding sequence multiplexing Department 20h.

Figure 136 is a flowchart showing the operation of the speech encoding device 420 according to the twenty-third embodiment.

The time envelope information encoding unit 420a calculates at least one of a time envelope of the high frequency signal input to the audio signal and a time envelope of the pseudo frequency modulated signal adjusted by the frequency envelope, and based on the calculated time envelope. The time envelope information about the high frequency signal is encoded (step S420-1).

In addition, the time envelope information encoding unit 420a may output the time envelope information about the low frequency signal and the time envelope information about the high frequency signal in the encoded sequence respectively encoded, or may use the time envelope information about the low frequency signal. And the time envelope information about the high frequency signal is encoded together into a coded sequence for output, which is not in the present invention. A form of a coded sequence with limited time envelope information. Further, similarly to the operation of the time envelope information encoding unit 26a of the speech encoding device 26 of the seventh embodiment, the encoding method of the low frequency time envelope information and the high frequency time envelope information is not limited.

Further, similarly to the voice encoding device 410 described in the twenty-second embodiment, the time envelope information encoding unit 420a can perform the processes of steps S410-1 and S420-1 together. Further, the first modification of the speech encoding device according to the seventh embodiment of the present invention is applicable to the speech encoding device 420 according to the present embodiment, and it is needless to say that there is no doubt. Moreover, the time envelope information of the high frequency signal can be generated according to the time envelope information of the low frequency signal.

[First Modification of the Sound Decoding Device According to the 23rd Embodiment]

Figure 137 is a diagram showing the configuration of a sound decoding device 320A according to a first modification of the twenty-third embodiment.

Fig. 138 is a flowchart showing the operation of the sound decoding device 320A according to the first modification of the twenty third embodiment.

The difference from the voice decoding device 320 described in the twenty-third embodiment is that the time envelope correction unit 15a is used instead of the time envelope correction unit 15a.

In the low-frequency envelope shape determining unit 10e of the audio decoding device 320A according to the present modification, the first, second, and third modified examples of the audio decoding device according to the first embodiment of the present invention can be applied. No doubt.

In addition, the first, second, and third modifications of the audio decoding device according to the fourth embodiment of the present invention, and the present invention, are applicable to the high-frequency time envelope shape determining unit 13a of the audio decoding device 320A according to the present modification. The first modification of the audio decoding device according to the fifth embodiment of the present invention and the first modification of the audio decoding device according to the seventh embodiment of the present invention are unquestionable.

[Second Modification of Sound Decoding Device According to the 23rd Embodiment]

Figure 331 is a diagram showing the configuration of a second modification 320B of the speech decoding device according to the twenty-third embodiment.

Figure 332 is a flowchart showing the operation of the second modification 320B of the speech decoding device according to the twenty-third embodiment.

The difference between the present modification and the audio decoding device 320 according to the 23rd embodiment is that the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the time envelope correcting unit 15a are provided. The low-frequency time envelope shape determining unit 16b and the time envelope correcting unit 18a are provided.

[Third Modification of Sound Decoding Device According to the 23rd Embodiment]

Figure 333 is a diagram showing the configuration of a third modification 320C of the speech decoding device according to the twenty-third embodiment.

Figure 334 is a flowchart showing the operation of a third modification 320C of the speech decoding device according to the twenty-third embodiment.

The sound decoding device according to the twenty-third embodiment of the present modification The high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) and the low-frequency time envelope correcting unit 10f include a high-frequency time envelope shape determining unit 16d and a low frequency. The time envelope correction unit 16e is the same.

[Fourth Modification of the Sound Decoding Device According to the 23rd Embodiment]

Figure 335 is a diagram showing the configuration of a fourth modification 320D of the speech decoding device according to the twenty-third embodiment.

Figure 336 is a flowchart showing the operation of the fourth modification 320D of the speech decoding device according to the twenty-third embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 18a, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Fifth Modification of the Sound Decoding Device of the 23rd Embodiment]

Figure 337 is a diagram showing the configuration of a fifth modification 320E of the speech decoding device according to the twenty-third embodiment.

Figure 338 is a flowchart showing the operation of a fifth modification 320E of the speech decoding device according to the twenty-third embodiment.

The difference between the present modification and the audio decoding device 320 according to the twenty-third embodiment is that the low-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a include the time envelope shape determining unit 16f. point.

[Sixth Modification of the Sound Decoding Device of the 23rd Embodiment]

Figure 339 is a diagram showing the configuration of a sixth modification 320F of the speech decoding device according to the twenty-third embodiment.

Figure 340 is a flowchart showing the operation of the sixth modification 320F of the speech decoding device according to the twenty-third embodiment.

The difference between the present modification and the audio decoding device 320A according to the first modification of the twenty-third embodiment is that the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the time envelope correction are used. In addition to the portion 15aA, the low-frequency envelope shape determining unit 16b and the time envelope correcting unit 18aA are provided.

[Seventh Modification of the Sound Decoding Device of the 23rd Embodiment]

Figure 341 is a diagram showing the configuration of a seventh modification 320G of the speech decoding device according to the twenty-third embodiment.

Figure 342 is a flowchart showing the operation of the seventh modification 320G of the speech decoding device according to the twenty-third embodiment.

The difference between the present modification and the audio decoding device 320A according to the first modification of the 23rd embodiment is that the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) may be used. In addition to the envelope correcting unit 10f, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[Eighth Modification of the Sound Decoding Device According to the 23rd Embodiment]

Figure 343 is a diagram showing the configuration of an eighth modification 320H of the speech decoding device according to the twenty-third embodiment.

Figure 344 is a flowchart showing the operation of the eighth modification 320H of the speech decoding device according to the twenty-third embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 18aA, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Ninth Modification of Sound Decoding Device of the 23rd Embodiment]

Figure 345 is a diagram showing the configuration of a ninth modification 320I of the speech decoding device according to the twenty-third embodiment.

Figure 346 is a flowchart showing the operation of the ninth modification 320I of the speech decoding device according to the twenty-third embodiment.

The difference between the present modification and the audio decoding device 320A according to the first modification of the twenty-third embodiment is that the low-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a have time envelopes. The shape determining unit 16f is the same.

[24th embodiment]

Figure 139 is a diagram showing the configuration of the audio decoding device 330 according to the twenty-fourth embodiment. The communication device of the audio decoding device 330 receives the multiplexed code sequence output from the lower voice encoding device 430, and outputs the decoded audio signal to the outside. Sound decoding As shown in FIG. 139, the function 330 includes a code sequence inverse multiplexing unit 170a, a switch group 170b, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analysis unit 13c, and a low frequency time envelope. Shape determining unit 10e, low-frequency time envelope correcting unit 10f, high-frequency time envelope shape determining unit 13a, time envelope correcting unit 300a, high-frequency signal generating unit 10g, decoding/inverse quantization unit 10h, frequency envelope adjusting unit 10i, and synthesis filtering The unit group 170c.

Figure 140 is a flowchart showing the operation of the speech decoding apparatus according to the twenty-fourth embodiment. Further, the order of the processing of steps S170-2 and S170-3 is not limited to the map 140 as long as the determination of the temporal envelope shape of the high-frequency signal and the decoding and inverse quantization of the band-extended portion are performed. The sequence of the flow chart.

In addition, the first, second, and third modifications of the audio decoding device according to the first embodiment of the present invention are applicable to the low-frequency time envelope shape determining unit 10e of the audio decoding device 330 according to the present modification. No doubt.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 330 according to the present modification, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. The first modification of the sound decoding device according to the seventh embodiment of the present invention is unquestionable.

Figure 141 is a diagram showing the configuration of the speech encoding device 430 according to the twenty-fourth embodiment. The communication device of the voice encoding device 430 receives the voice signal as the encoding target from the outside, and The encoded code sequence is output to the outside. As shown in FIG. 141, the speech encoding device 430 is functionally provided with a high-frequency signal generation control information encoding unit 270a, a down-conversion sampling unit 20a, a core encoding unit 20b, and analysis filter group units 20c and 20c1. The parameter encoding unit 20d, the envelope calculation unit 20e, the quantization/encoding unit 20f, the core decoding signal generation unit 20i, the sub-band signal power calculation unit 20j, the time envelope information coding unit 400a, and the code sequence multiplexing unit 270c.

Figure 142 is a flowchart showing the operation of the speech encoding device 430 according to the twenty-fourth embodiment. The time envelope information encoding unit 400a calculates and encodes the time envelope information in step S400-1. In addition, the time envelope information of the high frequency signal can be generated according to the time envelope information of the low frequency signal.

[First Modification of the Sound Decoding Device of the 24th Embodiment]

Figure 347 is a diagram showing the configuration of a first modification 330A of the speech decoding device according to the twenty-fourth embodiment.

Figure 348 is a flowchart showing the operation of the first modification 330A of the speech decoding device according to the twenty-fourth embodiment.

The difference between the present modification and the speech decoding device 330 according to the twenty-fourth embodiment is that the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the time envelope correcting unit 300a are provided. The low-frequency time envelope shape determining unit 16b and the time envelope correcting unit 300aA are provided.

[Second Modification of Sound Decoding Device According to the 24th Embodiment]

Figure 349 is a diagram showing the configuration of a second modification 330B of the speech decoding device according to the twenty-fourth embodiment.

Fig. 350 is a flowchart showing the operation of the second modification 330B of the speech decoding device according to the twenty-fourth embodiment.

The difference between the present modification and the speech decoding device 330 according to the twenty-fourth embodiment is that the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) and the low-frequency time envelope correcting unit 10f may be used. Further, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[Third Modification of Sound Decoding Device According to the 24th Embodiment]

Fig. 351 is a diagram showing the configuration of a third modification 330C of the speech decoding device according to the twenty-fourth embodiment.

Fig. 352 is a flowchart showing the operation of the third modification 330C of the speech decoding device according to the twenty-fourth embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 300aA, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Fourth Modification of the Sound Decoding Device According to the 24th Embodiment]

Figure 353 is a diagram showing the configuration of a fourth modification 330D of the speech decoding device according to the twenty-fourth embodiment.

Fig. 354 is a flowchart showing the operation of the fourth modification 330D of the speech decoding device according to the twenty-fourth embodiment.

The difference between the present modification and the audio decoding device 330 according to the twenty-fourth embodiment is that the low-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a include a time envelope shape determining unit 16f. point.

[25th embodiment]

Figure 143 is a diagram showing the configuration of the sound decoding device 340 according to the twenty-fifth embodiment. The communication device of the audio decoding device 340 receives the multiplexed code sequence output from the lower voice coding device 440, and outputs the decoded audio signal to the outside. As shown in FIG. 143, the audio decoding device 340 is functionally provided with a code sequence inverse multiplexing unit 170a, a switch group 170b, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analyzing unit 13c, and a low frequency. Time envelope shape determining unit 10e, low-frequency time envelope correcting unit 10f, high-frequency time envelope shape determining unit 13a, time envelope correcting unit 14a, high-frequency signal generating unit 10g, decoding/inverse quantization unit 10h, frequency envelope adjusting unit 10i, and The synthesis filter bank unit 170c.

Figure 144 is a flowchart showing the operation of the voice decoding device according to the twenty-fifth embodiment. Further, the order of the processing of steps S170-2 and S170-3 is not limited to the map 144 as long as the determination of the temporal envelope shape of the high-frequency signal and the decoding and inverse quantization of the band extension portion are performed. The sequence of the flow chart.

In the low-frequency envelope shape determining unit 10e of the audio decoding device 340 according to the present modification, the first, second, and third modified examples of the audio decoding device according to the first embodiment of the present invention can be applied. No doubt.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 340 according to the present modification, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. The first modification of the audio decoding device according to the fifth embodiment of the present invention and the first modification of the audio decoding device according to the seventh embodiment of the present invention are unquestionable.

Figure 145 is a diagram showing the configuration of the speech encoding device 440 according to the twenty-fifth embodiment. The communication device of the speech encoding device 440 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 145, the speech encoding device 440 is functionally provided with a high-frequency signal generation control information encoding unit 270a, a down-conversion sampling unit 20a, a core encoding unit 20b, and analysis filter group units 20c and 20c1. Parameter encoding unit 20d, envelope calculation unit 20e, quantization/encoding unit 20f, core decoding signal generation unit 20i, sub-band signal power calculation units 20j and 24b, pseudo-high-frequency signal generation unit 410b, time envelope information coding unit 410a, and coding The sequence multiplexing unit 270c.

Figure 146 is a flowchart showing the operation of the speech encoding device 440 according to the twenty-fifth embodiment. Further, the voice encoding device according to the seventh embodiment of the present invention can be applied to the voice encoding device 440 according to the present embodiment. The first modification to be placed should be without a doubt. Moreover, the time envelope shape of the high frequency signal can be generated based on the time envelope information of the low frequency signal.

[First Modification of Sound Decoding Device of the 25th Embodiment]

Figure 355 is a diagram showing the configuration of a first modification 340A of the speech decoding device according to the twenty-fifth embodiment.

Figure 356 is a flowchart showing the operation of the first modification 340A of the speech decoding device according to the twenty-fifth embodiment.

The difference between the present modification and the speech decoding device 340 according to the twenty-fifth embodiment is that the low-frequency envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the time envelope correcting unit 14a are provided. The low-frequency time envelope shape determining unit 16b and the time envelope correcting unit 17a are provided.

[Second Modification of Sound Decoding Device According to the 25th Embodiment]

Figure 357 is a diagram showing the configuration of a second modification 340B of the speech decoding device according to the twenty-fifth embodiment.

Figure 358 is a flowchart showing the operation of the second modification 340B of the speech decoding device according to the twenty-fifth embodiment.

The difference between the present modification and the audio decoding device 340 according to the twenty-fifth embodiment is that the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) and the low-frequency time envelope correcting unit 10f may be used. Further, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[Third Modification of Sound Decoding Device According to the 25th Embodiment]

Figure 359 is a diagram showing the configuration of a third modification 340C of the speech decoding device according to the twenty-fifth embodiment.

Fig. 360 is a flowchart showing the operation of a third modification 340C of the speech decoding device according to the twenty-fifth embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 17a, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Fourth Modification of the Sound Decoding Device of the 25th Embodiment]

Figure 361 is a diagram showing the configuration of a fourth modification 340D of the speech decoding device according to the twenty-fifth embodiment.

Figure 362 is a flowchart showing the operation of the fourth modification 340D of the speech decoding device according to the twenty-fifth embodiment.

The difference between the present modification and the speech decoding device 340 according to the twenty-fifth embodiment is that the low-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a include a time envelope shape determining unit 16f. point.

[26th embodiment]

Figure 147 is a diagram showing the configuration of a sound decoding device 350 according to the twenty-sixth embodiment. The communication device of the sound decoding device 350 will be recorded from below The multiplexed code sequence output by the voice encoding device 450 is received, and then the decoded audio signal is output to the outside. As shown in FIG. 147, the audio decoding device 350 is provided with a code sequence inverse multiplexing unit 170a, a switch group 170b, a core decoding unit 10b, an analysis filter bank unit 10c, a code sequence analysis unit 13c, and a low frequency. Time envelope shape determining unit 10e, low-frequency time envelope correcting unit 10f, high-frequency time envelope shape determining unit 13a, high-frequency signal generating unit 10g, decoding/inverse quantization unit 10h, frequency envelope adjusting unit 10i, time envelope correcting unit 15a, and The synthesis filter bank unit 170c.

Figure 148 is a flowchart showing the operation of the speech decoding apparatus according to the twenty-sixth embodiment. In addition, the order of the processing of steps S170-2 and S170-3 may be performed before the determination of the temporal envelope shape of the high-frequency signal and the decoding and inverse quantization of the band extension portion, and is not limited to FIG. The sequence of the flow chart.

In addition, the first, second, and third modifications of the audio decoding device according to the first embodiment of the present invention are applicable to the low-frequency time envelope shape determining unit 10e of the audio decoding device 350 according to the present embodiment. No doubt.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 350 according to the present embodiment, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. The first modification of the audio decoding device according to the fifth embodiment of the present invention and the first modification of the audio decoding device according to the seventh embodiment of the present invention are unquestionable.

Figure 149 is a diagram showing the configuration of the speech encoding device 450 according to the twenty-sixth embodiment. The communication device of the speech encoding device 450 receives the audio signal to be encoded from the outside, and outputs the encoded code sequence to the outside. As shown in FIG. 149, the speech encoding device 450 is functionally provided with a high-frequency signal generation control information encoding unit 270a, a down-conversion sampling unit 20a, a core encoding unit 20b, and analysis filter group units 20c and 20c1. Parameter encoding unit 20d, envelope calculation unit 270d, quantization/encoding unit 20f, core decoding signal generation unit 20i, sub-band signal power calculation units 20j and 24b, pseudo-high-frequency signal generation unit 410b, time envelope information coding unit 420a, and coding The sequence multiplexing unit 270c.

Figure 150 is a flowchart showing the operation of the speech encoding device 450 according to the twenty-sixth embodiment. Further, the first modification of the speech encoding device according to the seventh embodiment of the present invention is applicable to the speech encoding device 450 according to the present embodiment, and it is needless to say that there is no doubt. Moreover, the time envelope information of the high frequency signal can be generated according to the time envelope information of the low frequency signal.

[First Modification of Sound Decoding Device According to Sixteenth Embodiment]

Fig. 151 is a diagram showing the configuration of the sound decoding device 350A according to the first modification of the twenty sixth embodiment.

Figure 152 is a flowchart showing the operation of the sound decoding device 350A according to the first modification of the twenty-sixth embodiment. Further, the order of the processing of steps S170-2 and S170-3 is as long as the determination of the temporal envelope shape of the high-frequency signal and the decoding and inverse quantization of the band-extended portion. It is sufficient before the processing, and is not limited to the sequence of the flowchart of FIG.

The difference from the voice decoding device 350 according to the twenty-sixth embodiment is that the time envelope correcting unit 15a is used instead of the time envelope correcting unit 15a.

In the low-frequency envelope shape determining unit 10e of the audio decoding device 350A according to the present modification, the first, second, and third modified examples of the audio decoding device according to the first embodiment of the present invention can be applied. No doubt.

In the high-frequency envelope shape determining unit 13a of the audio decoding device 350A according to the present modification, the first, second, and third modified examples of the audio decoding device according to the fourth embodiment of the present invention can be applied. The first modification of the audio decoding device according to the fifth embodiment of the present invention and the first modification of the audio decoding device according to the seventh embodiment of the present invention are unquestionable.

[Second Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 363 is a diagram showing the configuration of a second modification 350B of the speech decoding device according to the twenty-sixth embodiment.

Figure 364 is a flowchart showing the operation of the second modification 350B of the speech decoding device according to the twenty-sixth embodiment.

The difference between the present modification and the audio decoding device 350 according to the twenty-sixth embodiment is that the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the time envelope correcting unit 15a are provided. The low-frequency time envelope shape determining unit 16b and the time package are provided. The network correction unit 18a is the same.

[Third Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 365 is a diagram showing the configuration of a third modification 350C of the speech decoding device according to the twenty-sixth embodiment.

Figure 366 is a flowchart showing the operation of a third modification 350C of the speech decoding device according to the twenty-sixth embodiment.

The difference between the present modification and the audio decoding device 350 according to the twenty-sixth embodiment is other than the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) and the low-frequency time envelope correcting unit 10f. Further, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[Fourth Modification of the Sound Decoding Device of the 26th Embodiment]

Figure 367 is a diagram showing the configuration of a fourth modification 350D of the speech decoding device according to the twenty-sixth embodiment.

Figure 368 is a flowchart showing the operation of the fourth modification 350D of the speech decoding device according to the twenty-sixth embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 18a, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Fifth Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 369 is a diagram showing the configuration of a fifth modification 350E of the speech decoding device according to the twenty-sixth embodiment.

Figure 370 is a flowchart showing the operation of a fifth modification 350E of the speech decoding device according to the twenty-sixth embodiment.

The difference between the present modification and the audio decoding device 350 according to the twenty-sixth embodiment is that the low-frequency envelope shape determining unit 10e and the high-frequency envelope shape determining unit 13a include a time envelope shape determining unit 16f. point.

[Sixth Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 371 is a diagram showing the configuration of a sixth modification 350F of the speech decoding device according to the twenty-sixth embodiment.

Figure 372 is a flowchart showing the operation of the sixth modification 350F of the speech decoding device according to the twenty-sixth embodiment.

The difference between the present modification and the audio decoding device 350A according to the first modification of the twenty-sixth embodiment is that the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the time envelope correction are used. In addition to the portion 15aA, the low-frequency envelope shape determining unit 16b and the time envelope correcting unit 18aA are provided.

[Seventh Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 373 is a diagram showing the configuration of a seventh modification 350G of the speech decoding device according to the twenty-sixth embodiment.

Figure 374 is a sound decoding device according to a twenty-sixth embodiment A flowchart of the operation of the seventh modification 350G.

The difference between the present modification and the audio decoding device 350A according to the first modification of the twenty-sixth embodiment is the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB), and the low-frequency time. In addition to the envelope correcting unit 10f, the high-frequency time envelope shape determining unit 16d and the low-frequency time envelope correcting unit 16e are provided.

[Eighth Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 375 is a diagram showing the configuration of an eighth modification 350H of the speech decoding device according to the twenty-sixth embodiment.

Figure 376 is a flowchart showing the operation of the eighth modification 350H of the speech decoding device according to the twenty-sixth embodiment.

In the present modification, the low-frequency envelope shape determining unit 16b, the pre-recording time envelope correcting unit 18aA, the pre-recording high-frequency envelope shape determining unit 16d, and the pre-recording low-frequency envelope correction unit 16e are provided.

[Ninth Modification of Sound Decoding Device According to Sixteenth Embodiment]

Figure 377 is a diagram showing the configuration of a ninth modification 350I of the speech decoding device according to the twenty-sixth embodiment.

Figure 378 is a flowchart showing the operation of a ninth modification 350I of the speech decoding device according to the twenty-sixth embodiment.

The difference between the present modification and the sound decoding device 350A according to the first modification of the twenty-sixth embodiment is a low frequency time package. In addition to the complex shape determining unit 10e and the high-frequency envelope shape determining unit 13a, the time envelope shape determining unit 16f is further provided.

[Sound decoding device of the twenty-seventh embodiment]

Figure 379 is a diagram showing the configuration of the audio decoding device 360 according to the twenty-seventh embodiment.

Figure 380 is a flowchart showing the operation of the sound decoding device 360 according to the twenty-seventh embodiment.

The time envelope correction unit 360a is based on the time envelope shape received from the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the high-frequency time envelope shape determining unit 13aC (of course, 13a) And at least one of the time envelope shapes received by the 13aA and 13aB), the complex sub-band signal of the low-frequency signal output from the analysis filter bank unit 10c and the high-frequency signal output from the frequency envelope adjusting unit 10i are corrected. The shape of the time envelope of the complex sub-band signal (S360-1).

When the time envelope shape of the complex sub-band signal of the high-frequency signal output from the frequency envelope adjusting unit 10i is corrected, the component constituting the high-frequency signal outputted from the frequency envelope adjusting unit 10i in a separated form may be corrected. At least one of the time envelope shapes.

The time envelope shape received from the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the high-frequency time envelope shape determining unit 13aC (of course, 13a, 13aA, and 13aB) can be charged. The time envelope shape may be the same or different.

[First Modification of Sound Decoding Device of the 27th Embodiment]

Figure 381 is a diagram showing the configuration of a first modification 360A of the speech decoding device according to the twenty-seventh embodiment.

382 is a flowchart showing the operation of the first modification 360A of the speech decoding device according to the twenty-seventh embodiment.

The difference between the present modification and the audio decoding device 360 according to the twenty-seventh embodiment is that the low-frequency envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the high-frequency envelope shape determining unit are not provided. 13aC (of course, 13a, 13aA, and 13aB) may be replaced with the time envelope shape determining unit 360b.

The time envelope determining unit 360b is based on the information about the low-frequency time envelope shape from the encoding sequence inverse multiplexing unit 10a, the low-frequency signal from the core decoding unit 10b, and the complex sub-band signal from the low-frequency signal of the analysis filter bank unit 10c. At least one of the information on the envelope shape of the high frequency time from the code sequence analysis unit 13c determines the time envelope shape (S360-2).

The determined time envelope shape may be different for the low frequency signal and the high frequency signal, or may be the same for the low frequency signal and the high frequency signal as a single time envelope shape.

The time envelope correcting unit 360aA corrects the complex sub-band signal of the low-frequency signal output from the analysis filter group unit 10c and the slave frequency envelope adjusting unit 10i based on the time envelope shape received from the previous time envelope shape determining unit 360b. Multi-frequency band of the output high frequency signal The shape of the time envelope of the signal (S360-1a).

The complex of the high frequency signal output from the frequency envelope adjustment unit 10i When the time envelope shape of the sub-band signal is corrected, the time envelope shape of at least one of the components constituting the high-frequency signal outputted from the frequency envelope adjusting unit 10i in a separated manner may be corrected.

[Sound decoding device of the 28th embodiment]

Figure 383 is a diagram showing the configuration of the sound decoding device 370 according to the twenty-eighth embodiment.

Figure 384 is a flowchart showing the operation of the sound decoding device 370 according to the twenty-eighth embodiment.

The time envelope correction unit 370a is based on the time envelope shape received from the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the high-frequency time envelope shape determining unit 13aC (of course, 13a) And at least one of the time envelope shapes received by 13aA and 13aB) to correct the shape of the time envelope of the complex sub-band signal of the low-frequency signal outputted from the analysis filter bank unit 10c, if generated according to the pre-recorded high-frequency signal When it is determined that the high frequency signal is to be generated, the shape of the time envelope of the plurality of sub-band signals of the high-frequency signal output from the frequency envelope adjusting unit 10i is also corrected (S370-1).

When the time envelope shape of the complex sub-band signal of the high-frequency signal output from the frequency envelope adjusting unit 10i is corrected, the component constituting the high-frequency signal outputted from the frequency envelope adjusting unit 10i in a separated form may be corrected. At least one of the time envelope shapes.

[First Modification of Sound Decoding Device According to 28th Embodiment]

Figure 385 is a diagram showing the configuration of a first modification 370A of the speech decoding device according to the twenty-eighth embodiment.

Figure 386 is a flowchart showing the operation of the first modification 370A of the speech decoding device according to the twenty-eighth embodiment.

The present modification is different from the audio decoding device 370 according to the 28th embodiment, and does not include the low-frequency time envelope shape determining unit 10eC (of course, 10e, 10eA, and 10eB) and the high-frequency time envelope shape determining unit. 13aC (of course, 13a, 13aA, and 13aB) may be replaced with the time envelope shape determining unit 360b.

The time envelope correction unit 370aA corrects the shape of the time envelope of the complex sub-band signal of the low-frequency signal output from the analysis filter group unit 10c based on the time envelope shape received from the previous time envelope shape determining unit 360b, if When it is determined that the high frequency signal is to be generated, the shape of the time envelope of the complex subband signal of the high frequency signal output from the frequency envelope adjusting unit 10i is corrected (S360-1a).

When the time envelope shape of the complex sub-band signal of the high-frequency signal output from the frequency envelope adjusting unit 10i is corrected, the component constituting the high-frequency signal outputted from the frequency envelope adjusting unit 10i in a separated form may be corrected. At least one of the time envelope shapes.

[Sound decoding device of the twenty-ninth embodiment]

Figure 387 is a diagram showing the configuration of a sound decoding device 380 according to the twenty-ninth embodiment.

Figure 388 is a flowchart showing the operation of the sound decoding device 380 according to the twenty-ninth embodiment.

The time envelope correction unit 380a corrects the low frequency from at least one of the time envelope shape determined by the low frequency time envelope shape determining unit 100c and the time envelope shape determined by the high frequency time envelope shape determining unit 110b. The shape of the time envelope of the low frequency signal output from the decoding unit 100b and the high frequency signal output from the high frequency decoding unit 100e (S380-1).

The time envelope shape determined by the low-frequency time envelope shape determining unit 100c and the time envelope shape determined by the high-frequency time envelope shape determining unit 110b may be the same or different.

[First Modification of Sound Decoding Device of the 29th Embodiment]

Figure 389 is a diagram showing the configuration of a first modification 380A of the speech decoding device according to the twenty-ninth embodiment.

Figure 390 is a flowchart showing the operation of the first modification 380A of the speech decoding device according to the twenty-ninth embodiment.

The difference between the present modification and the audio decoding device 380 according to the twenty-ninth embodiment is that the low-frequency envelope shape determining unit 100c and the high-frequency envelope shape determining unit 110b are replaced with the time envelope shape determining unit 120f. Instead of the time envelope correction unit 380a, the time envelope correction unit 380aA is replaced.

The time envelope correction unit 380aA corrects the low-frequency signal output from the low-frequency decoding unit 100b and the high-frequency signal output from the high-frequency decoding unit 100e based on the time envelope shape determined by the pre-recorded time envelope shape determining unit 120f. The shape of the time envelope (S380-1a).

[Sound decoding device of the 30th embodiment]

Figure 391 is a diagram showing the configuration of the sound decoding device 390 according to the 30th embodiment.

Figure 392 is a flowchart showing the operation of the sound decoding device 390 according to the 30th embodiment.

In the present modification, the time envelope correcting unit 380aA corrects the shape of the time envelope of the low-frequency signal output from the low-frequency decoding unit 100b based on the time envelope shape determined by the temporal envelope shape determining unit 120f. When it is determined that the high frequency signal is to be generated by the high frequency signal generation information, the shape of the time envelope of the high frequency signal output from the high frequency decoding unit 100e is also corrected (S380-1a).

10‧‧‧Sound decoding device

10a‧‧‧Code Sequence Reverse Multiplexing Department

10b‧‧‧Core Decoding Department

10c‧‧‧Analysis Filter Unit

10d‧‧‧Code Sequence Analysis Department

10e‧‧‧ Low Frequency Time Envelope Shape Determination Department

10f‧‧‧Low Time Envelope Correction Department

10g‧‧‧High Frequency Signal Generation Department

10h‧‧‧Decoding/Inverse Quantization Department

10i‧‧‧Frequency Envelope Adjustment Department

10j‧‧‧Synthesis Filter Group

Claims (5)

A sound decoding device is a sound decoding device that decodes an encoded audio signal and outputs an audio signal, and is characterized in that it includes a low frequency decoding unit that receives a code sequence containing information of the encoded low frequency signal. And decoding the low frequency signal; and the high frequency decoding unit receives the first information from the low frequency decoding unit, generates the high frequency signal based on the first information, and the high frequency time envelope shape determining unit is based on the encoding device The second information transmitted is used to determine the time envelope shape of the generated high-frequency signal; and the high-frequency time envelope correction unit is based on the time envelope shape determined by the pre-recorded high-frequency envelope shape determining unit. To correct the time envelope shape of the high-frequency signal that has been generated in the previous record and output it; and the low-frequency/high-frequency signal synthesis unit, which receives the low-frequency signal from the low-frequency decoding unit, and receives the time envelope shape from the high-frequency time envelope correction unit. The modified high-frequency signal combines the pre-recorded low-frequency signal with the high-frequency signal whose pre-recorded time envelope shape has been corrected. In order to obtain an audio signal to be output, the high-frequency time envelope correction unit is configured to record the time envelope shape in the high-frequency envelope shape determining unit in the high-frequency time envelope determining unit. In the signal, the time envelope shape is corrected and outputted by using any high frequency signal that has been generated before the time zone. The voice decoding device according to claim 1, wherein the high-frequency time envelope correction unit sets x _dec ( i ) when the time envelope shape is determined to be flat in the high-frequency envelope shape determining unit. ( t ( l ) ≦ i < t ( l + 1 )) will be used when high frequency signals are in any time zone The obtained signal is output as a high frequency signal whose time envelope shape has been corrected. The voice decoding device according to claim 1 or 2, further comprising: a code sequence inverse multiplexing unit that divides the code sequence including the audio signal encoded beforehand into at least: The coding sequence of the information of the low frequency signal of the signal, and the coding sequence of the information of the high frequency signal containing the audio signal before being encoded. The voice decoding device according to claim 1 or 2, wherein the high frequency time envelope correction unit corrects the high frequency decoding unit based on the time envelope shape determined by the high frequency time envelope shape determining unit. The time envelope shape of the intermediate signal when the high frequency signal is generated; the high frequency decoding unit performs the process of generating the residual high frequency signal by using the intermediate signal before the time envelope shape has been corrected. The voice decoding device according to claim 1 or 2, wherein the high-frequency time envelope correction unit sets x _dec (in the case where the time envelope shape is determined to be flat in the high-frequency envelope shape determining unit) i )( t ( l )≦ i < t ( l + 1 )) is a high frequency signal in any time zone and will be based on Divide by The signal obtained as a result is output as a high frequency signal whose time envelope shape has been corrected.